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New Accounting Pronouncements - Additional Information (Detail) - USD ($)	Sep. 30, 2020	Oct. 01, 2019	Sep. 30, 2019	Oct. 01, 2018
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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