Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Member Notes - Narrative (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
Member Notes - Narrative (Detail) - USD ($) $ in Thousands	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021	Sep. 30, 2021
Related Party Transaction [Line Items]
Share-based payment arrangement, expense	$ 22,190	$ 29,051	$ 46,556	$ 32,049
Member Notes
Related Party Transaction [Line Items]
Total amount due from members on the notes receivable	$ 0		0		$ 11,300
Member Notes \| Options
Related Party Transaction [Line Items]
Shares issued during the period (in shares)	1,072,849
Member Notes \| Partial Recourse Notes
Related Party Transaction [Line Items]
Notes receivable repayments	$ 10,600
Share-based payment arrangement, expense	0	$ 0	$ 1,100	$ 400
Member Notes \| Recourse
Related Party Transaction [Line Items]
Notes receivable repayments	$ 800