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Available-for-Sale Securities - Interest-bearing Investments in Available-for-Sale Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Sep. 30, 2019
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 559,387	$ 69,370
Gross Unrealized Gains	0	0
Gross Unrealized Losses	2	0
Fair Value	559,385	69,370
Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	754
Gross Unrealized Gains	0
Gross Unrealized Losses	2
Fair Value	752
Money Market Funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	558,633	69,370
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	$ 558,633	$ 69,370

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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