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Fair Value Measurements - Securities in Unrealized Loss Positions (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Sep. 30, 2018
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Unrealized Gross Losses	$ (256)
Less than 12 months, Unrealized Gross Losses		$ (29,854)
Less than 12 months, Fair Value	158,036
Less than 12 months, Fair Value		1,124,253
12 months or more, Unrealized Gross Losses	(11,082)
12 months or more, Unrealized Gross Losses		(63,328)
12 months or more, Fair Value	1,185,462
12 months or more, Fair Value		1,284,504
Total Unrealized Gross Losses	(11,338)
Total Unrealized Gross Losses		(93,182)
Total, Fair Value	1,343,498
Total, Fair Value		2,408,757
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Unrealized Gross Losses	0	(929)
Less than 12 months, Fair Value	0	49,072
12 months or more, Unrealized Gross Losses	(149)	(14)
12 months or more, Fair Value	49,851	24,988
Total Unrealized Gross Losses	(149)	(943)
Total, Fair Value	49,851	74,060
Municipal bonds due
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Unrealized Gross Losses		(24)
Less than 12 months, Fair Value		1,374
12 months or more, Unrealized Gross Losses		0
12 months or more, Fair Value		0
Total Unrealized Gross Losses		(24)
Total, Fair Value		1,374
U.S. government and agency securities
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Unrealized Gross Losses	(158)	(141)
Less than 12 months, Fair Value	63,483	37,565
12 months or more, Unrealized Gross Losses	(1,809)	(1,645)
12 months or more, Fair Value	145,522	76,499
Total Unrealized Gross Losses	(1,967)	(1,786)
Total, Fair Value	209,005	114,064
Equity securities
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Unrealized Gross Losses		(12)
Less than 12 months, Fair Value		488
12 months or more, Unrealized Gross Losses		0
12 months or more, Fair Value		0
Total Unrealized Gross Losses		(12)
Total, Fair Value		488
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Unrealized Gross Losses	(98)	(28,748)
Less than 12 months, Fair Value	94,553	1,035,754
12 months or more, Unrealized Gross Losses	(9,124)	(61,669)
12 months or more, Fair Value	990,089	1,183,017
Total Unrealized Gross Losses	(9,222)	(90,417)
Total, Fair Value	$ 1,084,642	$ 2,218,771

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