Number of subsidiaries involved in investigation.

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Period of time when the existing condition, situation or set of circumstances involving uncertainty occurred.

+ References

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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 unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Unrecognized Tax Benefit
-URI http://asc.fasb.org/extlink&oid=6527854

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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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Income Taxes - Additional Information (Detail) $ in Billions	Jun. 11, 2014 Subsidiary	Dec. 26, 2015 USD ($)	Sep. 26, 2015 USD ($)
Income Tax Contingency [Line Items]
Gross unrecognized tax benefits		$ 7.4	$ 6.9
Gross unrecognized tax benefits that would affect effective tax rate, if recognized		2.7	2.5
Unrecognized tax benefits, gross interest and penalties accrued		$ 1.4	$ 1.3
European Commission
Income Tax Contingency [Line Items]
Income Tax Contingency, Number of Subsidiaries \| Subsidiary	2
European Commission \| Maximum
Income Tax Contingency [Line Items]
Income Tax Contingency, Period of Occurrence	10 years