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Fair Value Measurements (Reconciliation Of Amortized Cost of Fair Value of Investments) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended		12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Sep. 30, 2011
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis	$ 3,584,569		$ 3,119,510
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]
Available-for-sale Securities, Gross Unrealized Gains	108,486		135,959
Available-for-sale Securities, Gross Unrealized Losses	(5,430)		(325)
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]
Available-for-sale Securities, Debt Securities	3,687,625		3,255,144
Investment Yield [Abstract]
Available-for-sale Securities, Yield	4.31%		4.62%
Held-to-maturity Securities, Yield	5.32%		5.33%
Yield	4.32%		4.63%
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount	38,707		47,036
Held to Maturity Securities, Gross Unrecognized Gains (Losses) [Abstract]
Held-to-maturity Securities, Unrecognized Holding Gain	3,083		3,580
Held to Maturity, Gross Unrecognized Losses [Abstract]
Held-to-maturity Securities, Unrecognized Holding Loss	0		0
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]
Held-to-maturity Securities, Debt Maturities, Fair Value	41,790		50,616
Investments	3,623,276		3,166,546
Gross Unrealized Gains on Investments	111,569		139,539
Gross Unrealized Losses on Investments	(5,430)		(325)
Investments, Fair Value Disclosure	3,729,415		3,305,760
Available-for-sale securities sold	3,500	131,361
US Treasury and Government [Member]
Investment Yield [Abstract]
Yield, After One Through Five Years	0.00%		0.00%
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]
Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Net Carrying Amount	0		0
Held to Maturity Securities, Gross Unrecognized Gains (Losses) [Abstract]
Unrecognized Gains, After One Through Five Years	0		0
Held to Maturity, Gross Unrecognized Losses [Abstract]
Unrecognized Holding Losses, After One Year Through Five Years	0		0
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]
Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Fair Value	0		0
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Investment Yield [Abstract]
Yield, Without Single Maturity	5.31%		5.31%
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]
Held-to-maturity Securities, Debt Maturities, without Single Maturity Date, Net Carrying Amount	37,912		45,086
Held to Maturity Securities, Gross Unrecognized Gains (Losses) [Abstract]
Gross Unrecognized Gains Without Single Maturity	3,055		3,507
Held to Maturity, Gross Unrecognized Losses [Abstract]
Gross Unrecognized Losses Without Single Maturity	0		0
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]
Held-to-maturity Securities, Debt Maturities, without Single Maturity Date, Fair Value	40,967		48,593
Municipal Bonds [Member]
Investment Yield [Abstract]
Yield, After One Through Five Years	0.00%		6.52%
Yield, After Five Through Ten Years	5.65%		5.60%
Yield, After Ten Years	0.00%		0.00%
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]
Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Net Carrying Amount	0		405
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount	795		1,545
Held-to-maturity Securities, Debt Maturities, after Ten Years, Net Carrying Amount	0		0
Held to Maturity Securities, Gross Unrecognized Gains (Losses) [Abstract]
Unrecognized Gains, After One Through Five Years	0		5
Unrecognized Holding Gains, After Five Years Through Ten Years	28		68
Gross Unrecognized Gains, After Ten Years	0		0
Held to Maturity, Gross Unrecognized Losses [Abstract]
Unrecognized Holding Losses, After One Year Through Five Years	0		0
Unrecognized Holding Losses, After Five Through Ten Years	0		0
Gross Unrecognized Losses, After Ten Years	0		0
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]
Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Fair Value	0		410
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Fair Value	823		1,613
Held-to-maturity Securities, Debt Maturities, after Ten Years, Fair Value	0		0
Municipal Bonds [Member]
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis	20,451		20,461
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]
Gross Unrealized Gains, After Ten Years	3,049		3,107
Gross Unrealized Losses, Over Ten Years	0		0
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value	23,500		23,568
Investment Yield [Abstract]
Yield, After Ten Years	6.45%		6.45%
US Treasury and Government [Member]
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]
Available-for-sale Securities, Debt Maturities, within One Year, Amortized Cost Basis	500		500
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Amortized Cost Basis	0		0
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Amortized Cost Basis	9,300		9,300
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis	0		175,515
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]
Gross Unrealized Gains, Within One Year	32		34
Gross Unrealized Gains After One Through Five Years	0		0
Gross Unrealized Gains, Five Through Ten Years	4,310		4,547
Gross Unrealized Gains, After Ten Years	0		631
Gross Unrealized Losses, Within One Year	0		0
Gross Unrealized Losses, After One Through Five Years	0		0
Gross Unrealized Losses, After Five Years Through Ten Years	0		0
Gross Unrealized Losses, Over Ten Years	0		0
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]
Available-for-sale Securities, Debt Maturities, within One Year, Fair Value	532		534
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Fair Value	0		0
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Fair Value	13,610		13,847
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value	0		176,146
Investment Yield [Abstract]
Yield, Within One Year	4.00%		4.00%
Yield, After One Through Five Years	0.00%		0.00%
Yield, After Five Through Ten Years	10.38%		10.38%
Yield, After Ten Years	0.00%		2.57%
Corporate Debt Securities [Member]
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Amortized Cost Basis	250,000
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Amortized Cost Basis	30,000		30,000
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]
Gross Unrealized Gains After One Through Five Years	0
Gross Unrealized Gains, Five Through Ten Years	234		284
Gross Unrealized Losses, After One Through Five Years	(1,448)
Gross Unrealized Losses, After Five Years Through Ten Years	(1,200)		(325)
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Fair Value	248,552
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Fair Value	29,034		29,959
Investment Yield [Abstract]
Yield, After One Through Five Years	0.89%
Yield, After Five Through Ten Years	4.00%		4.00%
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis	3,274,318		2,883,734
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]
Gross Unrealized Gains Without Single Maturity	100,861		127,356
Gross Unrealized Losses Without Single Maturity	(2,782)		0
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value	$ 3,372,397		$ 3,011,090
Investment Yield [Abstract]
Yield, Without Single Maturity	4.54%		4.72%

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