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Consolidated Condensed Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Aug. 31, 2012	Aug. 31, 2011	Aug. 31, 2012	Aug. 31, 2011
Net income	$ 27,742	$ 26,426	$ 55,601	$ 53,794
Auction rate security activity, before tax
Changes in fair market value		1,423		1,465
Settlements reclassified to income		(6)		(126)
Subtotal		1,417		1,339
Total other comprehensive income, before tax	(435)	2,413	1,296	1,139
Comprehensive income, before tax	27,307	28,839	56,897	54,933
Net income, tax	(4,774)	(2,833)	(9,161)	(5,596)
Auction rate security activity, tax
Changes in fair market value		(498)		(520)
Settlements reclassified to income		2		65
Subtotal		(496)		(455)
Total other comprehensive income, tax	152	(821)	(454)	(274)
Comprehensive income, tax	(4,622)	(3,654)	(9,615)	(5,870)
Net income	22,968	23,593	46,440	48,198
Auction rate security activity, net of tax
Changes in fair market value		925		945
Settlements reclassified to income		(4)		(61)
Subtotal		921		884
Total other comprehensive income, net of tax	(283)	1,592	842	865
Comprehensive income, net of tax	22,685	25,185	47,282	49,063
Interest rate swaps
Cash flow hedge activity, before tax
Changes in fair market value	(457)	(846)	(501)	(3,288)
Settlements reclassified to income	980	1,103	1,906	2,629
Subtotal	523	257	1,405	(659)
Cash flow hedge activity, tax
Changes in fair market value	160	296	175	1,407
Settlements reclassified to income	(343)	(386)	(667)	(1,081)
Subtotal	(183)	(90)	(492)	326
Cash flow hedge activity, net of tax
Changes in fair market value	(297)	(550)	(326)	(1,881)
Settlements reclassified to income	637	717	1,239	1,548
Subtotal	340	167	913	(333)
Foreign currency swaps and contracts
Cash flow hedge activity, before tax
Changes in fair market value	(933)	499	(23)	12
Ineffectiveness recorded in income	(14)	115	(49)	178
Settlements reclassified to income	(11)	125	(37)	269
Subtotal	(958)	739	(109)	459
Cash flow hedge activity, tax
Changes in fair market value	327	(159)	9	(3)
Ineffectiveness recorded in income	5	(36)	17	(56)
Settlements reclassified to income	3	(40)	12	(86)
Subtotal	335	(235)	38	(145)
Cash flow hedge activity, net of tax
Changes in fair market value	(606)	340	(14)	9
Ineffectiveness recorded in income	(9)	79	(32)	122
Settlements reclassified to income	(8)	85	(25)	183
Subtotal	$ (623)	$ 504	$ (71)	$ 314

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