XML 23 R43.htm IDEA: XBRL DOCUMENT v3.2.0.727
Fair Value Measurements - Investments by Contractual Maturity Date (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Sep. 30, 2014
Amortized Cost, Available-for-sale securities    
Amortized Cost $ 2,603,097 $ 3,016,432
Gross Unrealized Gains / Losses, Available-for-sale securities    
Gross unrealized gains 27,339 37,273
Gross unrealized loss (6,062) (4,263)
Fair Value, Available-for-sale securities    
Available-for-sale securities, at fair value $ 2,624,374 $ 3,049,442
Yield, Available-for-sale securities    
Yield 2.00% 1.99%
Yield, Held-to-maturity securities    
Investments $ 4,189,611 $ 4,564,697
Gross unrealized gains on investments 33,532 42,128
Gross unrealized losses on investments (45,053) (58,165)
Total financial assets $ 4,178,090 $ 4,548,660
Yield on investments 2.43% 2.38%
US Treasury and Government [Member]    
Amortized Cost, Available-for-sale securities    
1 to 5 years $ 135,967 $ 171,154
5 to 10 years 75,441 203,317
Over 10 years 316,929 354,828
Gross Unrealized Gains / Losses, Available-for-sale securities    
Gross unrealized gains, 1 to 5 years 2,078 2,585
Gross unrealized gains, 5 to 10 years 149 300
Gross unrealized gains, Over 10 years 435 1,028
Gross unrealized losses, 1 to 5 years (460) (748)
Gross unrealized losses, 5 to 10 years (7) (102)
Gross unrealized losses, Over 10 years (1,060) (419)
Fair Value, Available-for-sale securities    
1 to 5 years 137,585 172,991
5 to 10 years 75,583 203,515
Over 10 years $ 316,304 $ 355,437
Yield, Available-for-sale securities    
1 to 5 years 1.43% 1.26%
5 to 10 years 1.20% 1.45%
Over 10 years 1.31% 1.25%
Equity Securities [Member]    
Amortized Cost, Available-for-sale securities    
Within 1 year $ 500  
1 to 5 years 100,000 $ 100,500
5 to 10 years 0  
Gross Unrealized Gains / Losses, Available-for-sale securities    
Gross unrealized gains, Within 1 year 18  
Gross unrealized gains, 1 to 5 years 1,929 887
Gross unrealized gains, 5 to 10 years 0  
Gross unrealized losses, Within 1 year 0  
Gross unrealized losses, 1 to 5 years 0 0
Gross unrealized losses, 5 to 10 years 0  
Fair Value, Available-for-sale securities    
Within 1 year 518  
1 to 5 years 101,929 $ 101,387
5 to 10 years $ 0  
Yield, Available-for-sale securities    
Within 1 year 1.80%  
1 to 5 years 1.90% 1.90%
5 to 10 years 0.00%  
Corporate Debt Securities [Member]    
Amortized Cost, Available-for-sale securities    
Within 1 year $ 39,702 $ 15,000
1 to 5 years 303,094 302,540
5 to 10 years 133,306 138,201
Over 10 years 50,000 50,000
Gross Unrealized Gains / Losses, Available-for-sale securities    
Gross unrealized gains, Within 1 year 283 75
Gross unrealized gains, 1 to 5 years 1,414 2,372
Gross unrealized gains, 5 to 10 years 1,814 1,789
Gross unrealized gains, Over 10 years 750 0
Gross unrealized losses, Within 1 year 0 0
Gross unrealized losses, 1 to 5 years 0 0
Gross unrealized losses, 5 to 10 years (1,647) (970)
Gross unrealized losses, Over 10 years 0 0
Fair Value, Available-for-sale securities    
Within 1 year 39,985 15,075
1 to 5 years 304,508 304,912
5 to 10 years 133,473 139,020
Over 10 years $ 50,750 $ 50,000
Yield, Available-for-sale securities    
Within 1 year 0.68% 1.00%
1 to 5 years 0.81% 0.71%
5 to 10 years 1.54% 1.43%
Over 10 years 3.00% 3.00%
Municipal Bonds [Member]    
Amortized Cost, Available-for-sale securities    
1 to 5 years $ 2,278  
5 to 10 years 1,295  
Over 10 years 20,387 $ 20,402
Gross Unrealized Gains / Losses, Available-for-sale securities    
Gross unrealized gains, 1 to 5 years 0  
Gross unrealized gains, 5 to 10 years 0  
Gross unrealized gains, Over 10 years 3,330 3,279
Gross unrealized losses, 1 to 5 years (1)  
Gross unrealized losses, 5 to 10 years (14)  
Gross unrealized losses, Over 10 years 0 0
Fair Value, Available-for-sale securities    
1 to 5 years 2,277  
5 to 10 years 1,281  
Over 10 years $ 23,717 $ 23,681
Yield, Available-for-sale securities    
1 to 5 years 1.23%  
5 to 10 years 2.05%  
Over 10 years 6.45% 6.45%
Agency Pass-through Certificates [Member]    
Amortized Cost, Available-for-sale securities    
Without single maturity date $ 1,316,686 $ 1,561,639
Gross Unrealized Gains / Losses, Available-for-sale securities    
Gross unrealized gains, Without single maturity date 14,988 24,893
Gross unrealized losses, Without single maturity date (2,822) (2,024)
Fair Value, Available-for-sale securities    
Without single maturity date $ 1,328,852 $ 1,584,508
Yield, Available-for-sale securities    
Without single maturity date 2.58% 2.57%
Amortized Cost, Held-to-maturity securities    
Without single maturity date $ 1,586,514 $ 1,548,265
Gross Unrealized Gains / Losses, Held-to-maturity securities    
Gross unrealized gains, Without single maturity date 6,193 4,855
Gross unrealized losses, Without single maturity date (38,991) (53,902)
Fair Value, Held-to-maturity securities    
Without single maturity date $ 1,553,716 $ 1,499,218
Yield, Held-to-maturity securities    
Without a single maturity date 3.16% 3.13%
Commercial Mortgage Backed Securities [Member]    
Amortized Cost, Available-for-sale securities    
Without single maturity date $ 107,512 $ 98,851
Gross Unrealized Gains / Losses, Available-for-sale securities    
Gross unrealized gains, Without single maturity date 151 65
Gross unrealized losses, Without single maturity date (51) 0
Fair Value, Available-for-sale securities    
Without single maturity date $ 107,612 $ 98,916
Yield, Available-for-sale securities    
Without single maturity date 1.48% 1.49%