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Available-for-Sale Securities - Interest-bearing Investments in Available-for-Sale Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 132,908	$ 385,598
Gross Unrealized Gains		176
Gross Unrealized Losses	1,592	577
Fair Value	131,316	385,197
Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	48,252	98,367
Gross Unrealized Gains		176
Gross Unrealized Losses	721	158
Fair Value	47,531	98,385
U.S. Government Treasuries [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	23,656	84,558
Gross Unrealized Losses	398	195
Fair Value	23,258	84,363
U.S. Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	16,297	60,794
Gross Unrealized Losses	264	148
Fair Value	16,033	60,646
Money Market Funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	30,883	52,504
Fair Value	30,883	52,504
Asset Backed Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	9,312	47,108
Gross Unrealized Losses	135	34
Fair Value	9,177	47,074
Commercial Paper and Certificates of Deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		33,448
Fair Value		33,448
Supranational and Sovereign Debt [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	4,508	8,819
Gross Unrealized Losses	74	42
Fair Value	$ 4,434	$ 8,777

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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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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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