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Fair Value Measurements - Securities in Unrealized Loss Positions (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Sep. 30, 2018
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Unrealized Gross Losses	$ (16,326)	$ (29,854)
Less than 12 months, Fair Value	1,001,548	1,124,253
12 months or more, Unrealized Gross Losses	(49,188)	(63,328)
12 months or more, Fair Value	1,247,814	1,284,504
Total Unrealized Gross Losses	(65,514)
Total Unrealized Gross Losses		(93,182)
Total, Fair Value	2,249,362
Total, Fair Value		2,408,757
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Unrealized Gross Losses	(1,172)	(929)
Less than 12 months, Fair Value	61,415	49,072
12 months or more, Unrealized Gross Losses	(3,740)	(14)
12 months or more, Fair Value	96,261	24,988
Total Unrealized Gross Losses	(4,912)	(943)
Total, Fair Value	157,676
Total, Fair Value		74,060
Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Unrealized Gross Losses	(8)	(24)
Less than 12 months, Fair Value	1,398	1,374
12 months or more, Unrealized Gross Losses	0	0
12 months or more, Fair Value	0	0
Total Unrealized Gross Losses	(8)	(24)
Total, Fair Value	1,398
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	(286)	(141)
Less than 12 months, Fair Value	69,152	37,565
12 months or more, Unrealized Gross Losses	(1,646)	(1,645)
12 months or more, Fair Value	74,212	76,499
Total Unrealized Gross Losses	(1,932)	(1,786)
Total, Fair Value	143,364	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	(14,860)	(28,748)
Less than 12 months, Fair Value	869,583	1,035,754
12 months or more, Unrealized Gross Losses	(43,802)	(61,669)
12 months or more, Fair Value	1,077,341	1,183,017
Total Unrealized Gross Losses	(58,662)	(90,417)
Total, Fair Value	$ 1,946,924	$ 2,218,771

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