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Note G - Fair Value Measurements Reconciliation of amortized cost of fair value of investments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended		12 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Sep. 30, 2010
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis	$ 3,060,102		$ 3,060,102		$ 2,402,545
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]
Available-for-sale Securities, Gross Unrealized Gains	88,118		88,118		79,564
Available-for-sale Securities, Gross Unrealized Losses	(21,810)		(21,810)		(1,016)
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]
Available-for-sale Securities, Debt Securities	3,126,410		3,126,410		2,481,093
Investment Yield [Abstract]
Available-for-sale Securities, Yield			4.65%		5.02%
Held-to-maturity Securities, Yield			5.33%		5.60%
Yield			4.66%		5.04%
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount	49,503		49,503		80,107
Held to Maturity Securities, Gross Unrecognized Gains [Abstract]
Held-to-maturity Securities, Unrecognized Holding Gain	3,435		3,435		4,793
Held to Maturity, Gross Unrecognized Losses [Abstract]
Held-to-maturity Securities, Unrecognized Holding Loss	0		0		0
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]
Held-to-maturity Securities, Debt Maturities, Fair Value	52,938		52,938		84,900
Investments	3,109,605		3,109,605		2,482,652
Gross Unrealized Gains on Investments	91,553		91,553		84,357
Gross Unrealized Losses on Investments	(21,810)		(21,810)		(1,016)
Investments, Fair Value Disclosure	3,179,348		3,179,348		2,565,993
Available-for-sale securities sold			131,361	368,309
Gain on sale of investments	0	0	8,147	20,428
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		0
Held to Maturity Securities, Gross Unrecognized Gains [Abstract]
Unrecognized Gains, After One Through Five Years	0		0		0
Held to Maturity, Gross Unrecognized Losses [Abstract]
Unrecognized Holding Losses, After One Year Through Five Years					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		0
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		500
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Amortized Cost Basis	0		0		25,000
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Amortized Cost Basis	9,300		9,300		158,915
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis	295,974		295,974		150,000
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]
Gross Unrealized Gains, Within One Year	20		20		26
Gross Unrealized Gains After One Through Five Years	0		0		180
Gross Unrealized Gains, Five Through Ten Years	4,381		4,381		5,344
Gross Unrealized Gains, After Ten Years	1,502		1,502		1,161
Gross Unrealized Losses, Within One Year	0		0		0
Gross Unrealized Losses, AFter One Through Five Years	0		0		0
Gross Unrealized Losses, After Five Years Through Ten Years	0		0		(105)
Gross Unrealized Losses, Over Ten Years	(13,563)		(13,563)		(15)
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]
Available-for-sale Securities, Debt Maturities, within One Year, Fair Value	520		520		526
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Fair Value	0		0		25,180
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Fair Value	13,681		13,681		164,154
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value	283,913		283,913		151,146
Investment Yield [Abstract]
Yield, Within One Year			4.00%		4.00%
Yield, After One Through Five Years			0.00%		3.25%
Yield, After Five Through Ten Years			10.38%		3.59%
Yield, After Ten Years			3.07%		3.50%
Corporate Debt Securities [Member]
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Amortized Cost Basis	10,000		10,000		10,000
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]
Gross Unrealized Gains, Five Through Ten Years	811		811		0
Gross Unrealized Losses, After Five Years Through Ten Years	0		0		0
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Fair Value	10,811		10,811		10,000
Investment Yield [Abstract]
Yield, After Five Through Ten Years			6.00%		6.00%
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	2,744,328		2,744,328		2,058,130
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]
Gross Unrealized Gains Without Single Maturity	81,404		81,404		72,853
Gross Unrealized Losses Without Single Maturity	(8,247)		(8,247)		(896)
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value	2,817,485		2,817,485		2,130,087
Investment Yield [Abstract]
Yield, Without Single Maturity			4.79%		5.26%
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Investment Yield [Abstract]
Yield, Without Single Maturity			5.31%		5.59%
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]
Held-to-maturity Securities, Debt Maturities, without Single Maturity Date, Net Carrying Amount	47,553		47,553		73,052
Held to Maturity Securities, Gross Unrecognized Gains [Abstract]
Gross Unrecognized Gains Without Single Maturity	3,337		3,337		4,579
Held to Maturity, Gross Unrecognized Losses [Abstract]
Gross Unrecognized Losses Without Single Maturity	0		0		0
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]
Held-to-maturity Securities, Debt Maturities, without Single Maturity Date, Fair Value	50,890		50,890		77,631
Municipal Bonds [Member]
Investment Yield [Abstract]
Yield, After One Through Five Years			0.00%		6.11%
Yield, After Five Through Ten Years			5.72%		5.67%
Yield, After Ten Years			0.00%		5.60%
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		1,105
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount	1,950		1,950		1,940
Held-to-maturity Securities, Debt Maturities, after Ten Years, Net Carrying Amount	0		0		4,010
Held to Maturity Securities, Gross Unrecognized Gains [Abstract]
Unrecognized Gains, After One Through Five Years	0		0		65
Unrecognized Holding Gains, After Five Years Through Ten Years	98		98		115
Gross Unrecognized Gains, After Ten Years	0		0		34
Held to Maturity, Gross Unrecognized Losses [Abstract]
Unrecognized Holding Losses, After One Year Through Five Years					0
Unrecognized Holding Losses, After Five Through Ten Years	0		0		0
Gross Unrecognized Losses, After Ten Years					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		1,170
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Fair Value	2,048		2,048		2,055
Held-to-maturity Securities, Debt Maturities, after Ten Years, Fair Value	$ 0		$ 0		$ 4,044

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