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Available-for-Sale Securities - Interest-bearing Investments in Available-for-Sale Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2022	Sep. 30, 2021
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 533,762	$ 466,827
Gross Unrealized Gains	0	80
Gross Unrealized Losses	22,797	1,354
Fair Value	510,965	465,553
Money Market Funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	266,362	209,026
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	266,362	209,026
Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	183,266	191,445
Gross Unrealized Gains	0	76
Gross Unrealized Losses	14,958	1,084
Fair Value	168,308	190,437
U.S. Government Treasuries [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	44,658	54,987
Gross Unrealized Gains	0	4
Gross Unrealized Losses	4,429	239
Fair Value	40,229	54,752
Municipal Bond [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	17,759
Gross Unrealized Losses	1,634
Fair Value	16,125
Supranational and Sovereign Debt [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	11,882	7,479
Gross Unrealized Losses	1,288	26
Fair Value	10,594	7,453
Asset Backed Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	9,835	3,890
Gross Unrealized Losses	488	5
Fair Value	$ 9,347	$ 3,885

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- 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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