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New Accounting Pronouncements - Additional Information (Detail) - USD ($) |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Oct. 01, 2019 | Sep. 30, 2019 | Oct. 01, 2018 | Sep. 30, 2018
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |
Cumulative effect adjustment to retained earnings, net of tax as a result of adopting new standard |  | $ 202,455,000 |  | $ 166,071,000
Cumulative effect adjustment to increase in retained earnings, net of tax |  | 399,000 |  |
Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |
Cumulative effect adjustment to retained earnings, net of tax as a result of adopting new standard |  | $ 305,000 | $ 399,000 |
Accounting Standards Update 2016-02 [Member] | Minimum [Member] | Subsequent Event [Member] |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |
Operating lease, liabilities | $ 39,000,000 |  |  |
Operating lease, right-of-use asset | 39,000,000 |  |  |
Cumulative effect adjustment to increase in retained earnings, net of tax | 500,000 |  |  |
Accounting Standards Update 2016-02 [Member] | Maximum [Member] | Subsequent Event [Member] |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |
Operating lease, liabilities | 54,000,000 |  |  |
Operating lease, right-of-use asset | 54,000,000 |  |  |
Cumulative effect adjustment to increase in retained earnings, net of tax | $ 1,200,000 |  |  |

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