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Fair Value Measurements - Investments by Contractual Maturity Date (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Sep. 30, 2015
Amortized Cost, Available-for-sale securities    
Amortized Cost $ 1,959,164 $ 2,365,450
Gross Unrealized Gains / Losses, Available-for-sale securities    
Gross unrealized gains 24,304 28,158
Gross unrealized loss (13,599) (13,045)
Fair Value, Available-for-sale securities    
Available-for-sale securities, at fair value $ 1,969,869 $ 2,380,563
Yield, Available-for-sale securities    
Yield 2.17% 1.97%
Yield, Held-to-maturity securities    
Investments $ 3,451,644 $ 4,008,666
Gross unrealized gains on investments 45,068 38,674
Gross unrealized losses on investments (14,177) (29,357)
Total financial assets $ 3,482,535 $ 4,017,983
Yield on investments 2.60% 2.46%
Obligations of U.S. government    
Amortized Cost, Available-for-sale securities    
Within 1 year $ 25,980  
1 to 5 years 13,268 $ 105,065
5 to 10 years 49,174 119,071
Over 10 years 165,032 262,832
Gross Unrealized Gains / Losses, Available-for-sale securities    
Gross unrealized gains, Within 1 year 0  
Gross unrealized gains, 1 to 5 years 1,273 1,923
Gross unrealized gains, 5 to 10 years 0 35
Gross unrealized gains, Over 10 years 0 0
Gross unrealized losses, Within 1 year (65)  
Gross unrealized losses, 1 to 5 years (23) (274)
Gross unrealized losses, 5 to 10 years (1,526) (1,247)
Gross unrealized losses, Over 10 years (4,060) (4,941)
Fair Value, Available-for-sale securities    
Within 1 year 25,915  
1 to 5 years 14,518 106,714
5 to 10 years 47,648 117,859
Over 10 years $ 160,972 $ 257,891
Yield, Available-for-sale securities    
Within 1 year 0.73%  
1 to 5 years 7.49% 1.74%
5 to 10 years 1.06% 1.54%
Over 10 years 1.14% 1.23%
Equity securities    
Amortized Cost, Available-for-sale securities    
Within 1 year $ 500 $ 500
1 to 5 years 99,922 99,922
Gross Unrealized Gains / Losses, Available-for-sale securities    
Gross unrealized gains, Within 1 year 22 17
Gross unrealized gains, 1 to 5 years 1,441 1,513
Gross unrealized losses, Within 1 year 0 0
Gross unrealized losses, 1 to 5 years 0 0
Fair Value, Available-for-sale securities    
Within 1 year 522 517
1 to 5 years $ 101,363 $ 101,435
Yield, Available-for-sale securities    
Within 1 year 1.80% 1.80%
1 to 5 years 1.90% 1.90%
Corporate debt securities    
Amortized Cost, Available-for-sale securities    
Within 1 year $ 250,000 $ 24,787
1 to 5 years 71,540 311,435
5 to 10 years 89,954 100,000
Over 10 years 50,000 69,950
Gross Unrealized Gains / Losses, Available-for-sale securities    
Gross unrealized gains, Within 1 year 263 191
Gross unrealized gains, 1 to 5 years 148 1,190
Gross unrealized gains, 5 to 10 years 518 876
Gross unrealized gains, Over 10 years 875 953
Gross unrealized losses, Within 1 year 0 0
Gross unrealized losses, 1 to 5 years (106) (58)
Gross unrealized losses, 5 to 10 years (2,793) (3,524)
Gross unrealized losses, Over 10 years 0 0
Fair Value, Available-for-sale securities    
Within 1 year 250,263 24,978
1 to 5 years 71,582 312,567
5 to 10 years 87,679 97,352
Over 10 years $ 50,875 $ 70,903
Yield, Available-for-sale securities    
Within 1 year 1.07% 0.53%
1 to 5 years 1.97% 0.88%
5 to 10 years 2.02% 1.47%
Over 10 years 3.00% 3.00%
Municipal bonds due    
Amortized Cost, Available-for-sale securities    
1 to 5 years $ 2,307 $ 2,285
5 to 10 years 1,327 1,303
Over 10 years 20,367 20,382
Gross Unrealized Gains / Losses, Available-for-sale securities    
Gross unrealized gains, 1 to 5 years 18 8
Gross unrealized gains, 5 to 10 years 65 7
Gross unrealized gains, Over 10 years 3,404 3,138
Gross unrealized losses, 1 to 5 years 0 0
Gross unrealized losses, 5 to 10 years 0 0
Gross unrealized losses, Over 10 years 0 0
Fair Value, Available-for-sale securities    
1 to 5 years 2,325 2,293
5 to 10 years 1,392 1,310
Over 10 years $ 23,771 $ 23,520
Yield, Available-for-sale securities    
1 to 5 years 1.23% 1.23%
5 to 10 years 2.05% 2.05%
Over 10 years 6.45% 6.45%
Agency pass-through certificates    
Amortized Cost, Available-for-sale securities    
Without single maturity date $ 1,033,736 $ 1,144,787
Gross Unrealized Gains / Losses, Available-for-sale securities    
Gross unrealized gains, Without single maturity date 16,277 18,222
Gross unrealized losses, Without single maturity date (3,507) (2,491)
Fair Value, Available-for-sale securities    
Without single maturity date $ 1,046,506 $ 1,160,518
Yield, Available-for-sale securities    
Without single maturity date 2.58% 2.48%
Amortized Cost, Held-to-maturity securities    
Without single maturity date $ 1,492,480 $ 1,643,216
Gross Unrealized Gains / Losses, Held-to-maturity securities    
Gross unrealized gains, Without single maturity date 20,764 10,516
Gross unrealized losses, Without single maturity date (578) (16,312)
Fair Value, Held-to-maturity securities    
Without single maturity date $ 1,512,666 $ 1,637,420
Yield, Held-to-maturity securities    
Without a single maturity date 3.18% 3.19%
Commercial MBS    
Amortized Cost, Available-for-sale securities    
Without single maturity date $ 86,057 $ 103,131
Gross Unrealized Gains / Losses, Available-for-sale securities    
Gross unrealized gains, Without single maturity date 0 85
Gross unrealized losses, Without single maturity date (1,519) (510)
Fair Value, Available-for-sale securities    
Without single maturity date $ 84,538 $ 102,706
Yield, Available-for-sale securities    
Without single maturity date 1.79% 1.51%