Common Stock, Capital Shares Reserved for Future Issuance, Annual Percentage Increase

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Conversion Right of Units, Shares

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Typical Award Vesting Rights, Percentage

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- Definition

Share-based Compensation, Volume Weighted Average Trading Price of Stock, Number of Trading Days Used in Calculation

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- Definition

Aggregate number of common shares reserved for future issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Unrecognized cost of unvested share-based compensation awards.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)(2)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

Percentage of vesting of share-based compensation awards.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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Shareholders' Equity - Stock-Based Compensation Additional Information (Details) - USD ($) $ in Thousands		12 Months Ended
	May 27, 2015	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Intrinsic value of stock options exercised		$ 311,354	$ 96,926
Remaining unamortized compensation cost related to unvested stock options and RSUs		$ 157,471	$ 94,112
Remaining unamortized compensation cost related to unvested stock options and RSUs, period of recognition		2 years 10 months 21 days
Restricted share units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units granted (in shares)		1,172,707	2,116,701
Legacy Option Plan \| Class B Multiple Voting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares receivable per option exercised (in shares)	1
Legacy Option Plan \| Employee and Non-Employee Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	4 years
Award vesting amount (as a percent)	25.00%
Legacy Option Plan \| Employee and Non-Employee Stock Options \| First Year
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting amount (as a percent)	25.00%
Stock Option Plan \| Class A Subordinate Voting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Trading days used to calculate volume weighted average trading price	5 days
Stock Option Plan \| Employee and Non-Employee Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	4 years
Stock Option Plan \| Employee and Non-Employee Stock Options \| First Year
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting amount (as a percent)	25.00%
Long-Term Incentive Plan \| Class A Subordinate Voting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares receivable per option exercised (in shares)	1
Long-Term Incentive Plan \| Restricted share units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	4 years
Award vesting amount (as a percent)	25.00%
Long-Term Incentive Plan \| Restricted share units \| First Year
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting amount (as a percent)	25.00%
RSU Vesting (as a percent)	33.33%
Long-Term Incentive Plan \| Restricted share units \| Second Year
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSU Vesting (as a percent)	33.33%
Long-Term Incentive Plan \| Restricted share units \| Third Year
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSU Vesting (as a percent)	33.33%
Long-Term Incentive Plan \| Performance Share Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units granted (in shares)		0
Long-Term Incentive Plan \| Deferred Share Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units granted (in shares)		0
Stock Option Plan and LTIP \| Class A Subordinate Voting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for issuance (in shares)	3,743,692
Shares available for issuance, percentage of annual increase	5.00%
Stock Option Plan and LTIP \| Class A Subordinate Voting \| Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for issuance (in shares)				10,740,971