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Available-for-Sale Securities - Interest-bearing Investments in Available-for-Sale Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 466,827	$ 559,387
Gross Unrealized Gains	80	0
Gross Unrealized Losses	1,354	2
Fair Value	465,553	559,385
Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	191,445	754
Gross Unrealized Gains	76	0
Gross Unrealized Losses	1,084	2
Fair Value	190,437	752
Money Market Funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	209,026	558,633
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	209,026	$ 558,633
U.S. Government Treasuries [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	54,987
Gross Unrealized Gains	4
Gross Unrealized Losses	239
Fair Value	54,752
Asset Backed Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,890
Gross Unrealized Losses	5
Fair Value	3,885
Supranational and Sovereign Debt [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	7,479
Gross Unrealized Losses	26
Fair Value	$ 7,453

X

- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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