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Available-for-Sale Securities - Interest-bearing Investments in Available-for-Sale Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Sep. 30, 2018
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 69,370	$ 132,908
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	1,592
Fair Value	69,370	131,316
Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		48,252
Gross Unrealized Gains		0
Gross Unrealized Losses		721
Fair Value		47,531
Money Market Funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	69,370	30,883
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	$ 69,370	30,883
U.S. Government Treasuries [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		23,656
Gross Unrealized Gains		0
Gross Unrealized Losses		398
Fair Value		23,258
U.S. Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		16,297
Gross Unrealized Gains		0
Gross Unrealized Losses		264
Fair Value		16,033
Asset Backed Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		9,312
Gross Unrealized Gains		0
Gross Unrealized Losses		135
Fair Value		9,177
Supranational and Sovereign Debt [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		4,508
Gross Unrealized Gains		0
Gross Unrealized Losses		74
Fair Value		$ 4,434

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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Amount of 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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