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Fair Value Measurements - Securities in Unrealized Loss Positions (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Sep. 30, 2018
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Unrealized Gross Losses	$ (1,613)
Less than 12 months, Unrealized Gross Losses		$ (29,854)
Less than 12 months, Fair Value	294,394
Less than 12 months, Fair Value		1,124,253
12 months or more, Unrealized Gross Losses	(27,807)
12 months or more, Unrealized Gross Losses		(63,328)
12 months or more, Fair Value	1,800,801
12 months or more, Fair Value		1,284,504
Total Unrealized Gross Losses	(29,420)
Total Unrealized Gross Losses		(93,182)
Total, Fair Value	2,095,195
Total, Fair Value		2,408,757
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Unrealized Gross Losses	(574)	(929)
Less than 12 months, Fair Value	49,521	49,072
12 months or more, Unrealized Gross Losses	(263)	(14)
12 months or more, Fair Value	49,737	24,988
Total Unrealized Gross Losses	(837)	(943)
Total, Fair Value	99,258	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	(621)	(141)
Less than 12 months, Fair Value	84,101	37,565
12 months or more, Unrealized Gross Losses	(1,619)	(1,645)
12 months or more, Fair Value	129,356	76,499
Total Unrealized Gross Losses	(2,240)	(1,786)
Total, Fair Value	213,457	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	(418)	(28,748)
Less than 12 months, Fair Value	160,772	1,035,754
12 months or more, Unrealized Gross Losses	(25,925)	(61,669)
12 months or more, Fair Value	1,621,708	1,183,017
Total Unrealized Gross Losses	(26,343)	(90,417)
Total, Fair Value	$ 1,782,480	$ 2,218,771

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Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer.

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