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New Accounting Pronouncements - Additional Information (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020	Oct. 01, 2019
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Operating lease, liabilities	$ 107,526
Operating lease right-of-use assets, net	104,901	$ 37,991
Cumulative effect adjustment to retained earnings, net after tax	$ 432,678	$ 277,699
Accounting Standards Update 2016-02 [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Operating lease, liabilities			$ 44,000
Operating lease right-of-use assets, net			42,100
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

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Present value of lessee's discounted obligation for lease payments from operating lease.

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