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New Accounting Pronouncements - Additional Information (Detail) - USD ($) | Sep. 30, 2020 | Oct. 01, 2019 | Sep. 30, 2019 | Oct. 01, 2018
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New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |
Cumulative effect adjustment to retained earnings, net after tax | $ 277,699,000 |  | $ 202,455,000 |
Operating lease, liabilities | 40,327,000 |  |  |
Operating lease right-of-use assets, net | $ 37,991,000 |  |  |
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 after tax |  |  | $ 305,000 | $ 399,000
Accounting Standards Update 2016-02 [Member] |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |
Operating lease, liabilities |  | $ 44,000,000.0 |  |
Operating lease right-of-use assets, net |  | 42,100,000 |  |
Accounting Standards Update 2016-02 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |
Cumulative effect adjustment to retained earnings, net after tax |  | $ 600,000 |  |

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