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Fair Value Measurements - Investments by Contractual Maturity Date (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Sep. 30, 2015
--- | --- | ---
Amortized Cost, Available-for-sale securities |  |
Amortized Cost | $ 2,085,416 | $ 2,365,450
Gross Unrealized Gains / Losses, Available-for-sale securities |  |
Gross unrealized gains | 24,587 | 28,158
Gross unrealized loss | (12,917) | (13,045)
Fair Value, Available-for-sale securities |  |
Available-for-sale securities, at fair value | $ 2,097,086 | $ 2,380,563
Yield, Available-for-sale securities |  |
Yield | 2.13% | 1.97%
Yield, Held-to-maturity securities |  |
Investments | $ 3,643,503 | $ 4,008,666
Gross unrealized gains on investments | 36,945 | 38,674
Gross unrealized losses on investments | (19,013) | (29,357)
Total financial assets | $ 3,661,435 | $ 4,017,983
Yield on investments | 2.58% | 2.46%
Obligations of U.S. government |  |
Amortized Cost, Available-for-sale securities |  |
1 to 5 years | $ 44,763 | $ 105,065
5 to 10 years | 50,399 | 119,071
Over 10 years | 173,258 | 262,832
Gross Unrealized Gains / Losses, Available-for-sale securities |  |
Gross unrealized gains, 1 to 5 years | 1,467 | 1,923
Gross unrealized gains, 5 to 10 years | 0 | 35
Gross unrealized gains, Over 10 years | 0 | 0
Gross unrealized losses, 1 to 5 years | (257) | (274)
Gross unrealized losses, 5 to 10 years | (1,726) | (1,247)
Gross unrealized losses, Over 10 years | (3,361) | (4,941)
Fair Value, Available-for-sale securities |  |
1 to 5 years | 45,973 | 106,714
5 to 10 years | 48,673 | 117,859
Over 10 years | $ 169,897 | $ 257,891
Yield, Available-for-sale securities |  |
1 to 5 years | 2.72% | 1.74%
5 to 10 years | 1.04% | 1.54%
Over 10 years | 1.06% | 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 | 19 | 17
Gross unrealized gains, 1 to 5 years | 1,150 | 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 | 519 | 517
1 to 5 years | $ 101,072 | $ 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 | $ 274,957 | $ 24,787
1 to 5 years | 91,505 | 311,435
5 to 10 years | 89,953 | 100,000
Over 10 years | 50,000 | 69,950
Gross Unrealized Gains / Losses, Available-for-sale securities |  |
Gross unrealized gains, Within 1 year | 258 | 191
Gross unrealized gains, 1 to 5 years | 355 | 1,190
Gross unrealized gains, 5 to 10 years | 1,167 | 876
Gross unrealized gains, Over 10 years | 974 | 953
Gross unrealized losses, Within 1 year | 0 | 0
Gross unrealized losses, 1 to 5 years | (113) | (58)
Gross unrealized losses, 5 to 10 years | (2,787) | (3,524)
Gross unrealized losses, Over 10 years | 0 | 0
Fair Value, Available-for-sale securities |  |
Within 1 year | 275,215 | 24,978
1 to 5 years | 91,747 | 312,567
5 to 10 years | 88,333 | 97,352
Over 10 years | $ 50,974 | $ 70,903
Yield, Available-for-sale securities |  |
Within 1 year | 1.02% | 0.53%
1 to 5 years | 1.85% | 0.88%
5 to 10 years | 2.00% | 1.47%
Over 10 years | 3.00% | 3.00%
Municipal bonds due |  |
Amortized Cost, Available-for-sale securities |  |
1 to 5 years | $ 2,300 | $ 2,285
5 to 10 years | 1,319 | 1,303
Over 10 years | 20,372 | 20,382
Gross Unrealized Gains / Losses, Available-for-sale securities |  |
Gross unrealized gains, 1 to 5 years | 8 | 8
Gross unrealized gains, 5 to 10 years | 34 | 7
Gross unrealized gains, Over 10 years | 3,302 | 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 | 2,308 | 2,293
5 to 10 years | 1,353 | 1,310
Over 10 years | $ 23,674 | $ 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 | $ 1,093,626 | $ 1,144,787
Gross Unrealized Gains / Losses, Available-for-sale securities |  |
Gross unrealized gains, Without single maturity date | 15,593 | 18,222
Gross unrealized losses, Without single maturity date | (4,202) | (2,491)
Fair Value, Available-for-sale securities |  |
Without single maturity date | $ 1,105,017 | $ 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 | $ 1,558,087 | $ 1,643,216
Gross Unrealized Gains / Losses, Held-to-maturity securities |  |
Gross unrealized gains, Without single maturity date | 12,358 | 10,516
Gross unrealized losses, Without single maturity date | (6,096) | (16,312)
Fair Value, Held-to-maturity securities |  |
Without single maturity date | $ 1,564,349 | $ 1,637,420
Yield, Held-to-maturity securities |  |
Without a single maturity date | 3.19% | 3.19%
Other Commercial MBS |  |
Amortized Cost, Available-for-sale securities |  |
Without single maturity date | $ 92,542 | $ 103,131
Gross Unrealized Gains / Losses, Available-for-sale securities |  |
Gross unrealized gains, Without single maturity date | 260 | 85
Gross unrealized losses, Without single maturity date | (471) | (510)
Fair Value, Available-for-sale securities |  |
Without single maturity date | $ 92,331 | $ 102,706
Yield, Available-for-sale securities |  |
Without single maturity date | 1.73% | 1.51%

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