Enterprise-wide Disclosures and Concentration of Business - Additional Information (Detail) |
12 Months Ended | ||
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Sep. 30, 2019 |
Sep. 30, 2018 |
Sep. 30, 2017 |
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| U.S. | Geographic Concentration Risk | Net Operating Revenue | |||
| Concentration Risk [Line Items] | |||
| Concentration risk, percentage | 45.00% | 45.00% | 47.00% |
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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. No definition available.
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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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