Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Feb. 28, 2014	Nov. 30, 2013	Aug. 31, 2013	May 31, 2013	Feb. 28, 2013	Nov. 30, 2012	Aug. 31, 2012	May 31, 2012	Feb. 28, 2014	Feb. 28, 2013	Feb. 29, 2012
OPERATING ACTIVITIES:
Net earnings	$ 99,209	$ 106,452	$ 140,274	$ 146,651	$ 107,221	$ 94,681	$ 111,636	$ 120,746	$ 492,586	$ 434,284	$ 413,795
Adjustments to reconcile net earnings to net cash used in operating activities:
Deferred income tax (benefit) provision									(17,185)	3,858	(872)
FINANCING ACTIVITIES:
Cash and cash equivalents at beginning of year				449,364					449,364
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$ 627,901				$ 449,364				$ 627,901	$ 449,364