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Fair Value Measurements (Reconciliation Of Amortized Cost of Fair Value of Investments) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended		12 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Sep. 30, 2012
Available-for-Sale Securities, Amortized Cost
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis	$ 2,050,031		$ 1,760,668
Available-for-Sale Securities, Gross Unrealized Gains (Losses)
Available-for-sale Securities, Gross Unrealized Gains	15,781		22,161
Available-for-sale Securities, Gross Unrealized Losses	7,668		1,124
Available-for-Sale Securities, Fair Value
Available-for-sale Securities, Debt Securities	2,058,144		1,781,705
Available-for-Sale Securities, Yield
Available-for-sale Securities, Yield	1.53%		1.99%
Held-to-maturity Securities, Yield	3.02%		3.10%
Yield	2.18%		2.44%
Held-to-Maturity Securities, Amortized Cost
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount	1,589,779		1,191,487
Held-to-Maturity Securities, Gross Unrealized Gains
Held-to-maturity Securities, Unrecognized Holding Gain	3,058		25,736
Held-to-Maturity Securities, Gross Unrealized Losses
Held-to-maturity Securities, Unrecognized Holding Loss	70,367		0
Held-to-Maturity Securities, Fair Value
Held-to-maturity Securities, Debt Maturities, Fair Value	1,522,470		1,217,223
Investments	3,639,810		2,952,155
Gross Unrealized Gains on Investments	18,839		47,897
Gross Unrealized Losses on Investments	(78,035)		(1,124)
Investments, Fair Value Disclosure	3,580,614		2,998,928
Available-for-sale securities sold	43,198	3,500
Obligations of U.S. Government [Member]
Available-for-Sale Securities, Yield
1 to 5 years	0.00%		0.00%
Held-to-Maturity Securities, Amortized Cost
5 to 10 years	0		0
Held-to-Maturity Securities, Gross Unrealized Gains
1 to 5 years	0		0
Held-to-Maturity Securities, Gross Unrealized Losses
1 to 5 years	0		0
Held-to-Maturity Securities, Fair Value
1 to 5 years	0		0
Mortgage-backed Securities, Agency Pass-Through Certificates [Member]
Available-for-Sale Securities, Yield
Agency pass-through certificates	3.02%		3.10%
Held-to-Maturity Securities, Amortized Cost
Agency pass-through certificates	1,589,779		1,190,692
Held-to-Maturity Securities, Gross Unrealized Gains
Agency pass-through certificates	3,058		25,729
Held-to-Maturity Securities, Gross Unrealized Losses
Agency pass-through certificates	(70,367)		0
Held-to-Maturity Securities, Fair Value
Agency pass-through certificates	1,522,470		1,216,421
Municipal Bonds [Member]
Available-for-Sale Securities, Gross Unrealized Gains (Losses)
Within 1 year	0		7
Within 1 year	0		0
Available-for-Sale Securities, Yield
Within 1 year	0.00%		5.80%
1 to 5 years	0.00%		0.00%
5 to 10 years	0.00%		0.00%
Over 10 years	0.00%		0.00%
Held-to-Maturity Securities, Amortized Cost
Within 1 year	0		795
5 to 10 years	0		0
5 to 10 years	0		0
Over 10 years	0		0
Held-to-Maturity Securities, Gross Unrealized Gains
1 to 5 years	0		0
5 to 10 years	0		0
Over 10 years	0		0
Held-to-Maturity Securities, Gross Unrealized Losses
1 to 5 years	0		0
5 to 10 years	0		0
Over 10 years	0		0
Held-to-Maturity Securities, Fair Value
Within 1 year	0		802
1 to 5 years	0		0
5 to 10 years	0		0
Over 10 years	0		0
Municipal Bonds [Member]
Available-for-Sale Securities, Amortized Cost
Over 10 years	20,427		20,442
Available-for-Sale Securities, Gross Unrealized Gains (Losses)
Over 10 years	2,118		4,402
Over 10 years	0		0
Available-for-Sale Securities, Fair Value
Over 10 years	22,545		24,844
Available-for-Sale Securities, Yield
Over 10 years	6.45%		6.45%
Obligations of U.S. Government [Member]
Available-for-Sale Securities, Amortized Cost
Within 1 year	125,500		19,999
1 to 5 years	61,002		0
5 to 10 years	81,600		59,300
Over 10 years	279,423		100,000
Available-for-Sale Securities, Gross Unrealized Gains (Losses)
Within 1 year	17		42
1 to 5 years	3,494		0
5 to 10 years	0		4,225
Over 10 years	0		0
Within 1 year	(2,231)		(6)
1 to 5 years	(374)		0
5 to 10 years	(487)		0
Over 10 years	(1,845)		0
Available-for-Sale Securities, Fair Value
Within 1 year	123,286		20,035
1 to 5 years	64,122		0
5 to 10 years	81,113		63,525
Over 10 years	277,578		100,000
Available-for-Sale Securities, Yield
Within 1 year	1.12%		0.57%
1 to 5 years	2.00%		0.00%
5 to 10 years	0.73%		2.21%
Over 10 years	0.92%		1.05%
Corporate Debt Securities [Member]
Available-for-Sale Securities, Amortized Cost
Within 1 year	19,500
1 to 5 years	317,103		336,340
5 to 10 years	113,024		62,919
Available-for-Sale Securities, Gross Unrealized Gains (Losses)
Within 1 year	3
1 to 5 years	2,045		2,810
5 to 10 years	975		1,324
Within 1 year	0
1 to 5 years	(114)		(61)
5 to 10 years	(425)		(7)
Available-for-Sale Securities, Fair Value
Within 1 year	19,503
1 to 5 years	319,034		339,089
5 to 10 years	113,574		64,236
Available-for-Sale Securities, Yield
Within 1 year	0.49%
1 to 5 years	0.84%		0.91%
5 to 10 years	1.59%		2.73%
Mortgage-backed Securities, Agency Pass-Through Certificates [Member]
Available-for-Sale Securities, Amortized Cost
Agency pass-through certificates	1,032,452		1,161,668
Available-for-Sale Securities, Gross Unrealized Gains (Losses)
Agency pass-through certificates	7,129		9,358
Agency pass-through certificates	(2,192)		(1,050)
Available-for-Sale Securities, Fair Value
Agency pass-through certificates	$ 1,037,389		$ 1,169,976
Available-for-Sale Securities, Yield
Agency pass-through certificates	1.91%		2.28%

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Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

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