Comprehensive Income (Loss) (Details) (USD $)	May 31, 2012	Feb. 29, 2012
Unrealized holding losses on cash flow hedges, net of tax	$ (4,464,000)	$ (5,589,000)
Interest rate swaps
Unrealized holding losses on cash flow hedges, net of tax	(4,986,000)	(5,559,000)
Deferred tax benefits (liabilities) included in accumulated other comprehensive loss	2,680,000	2,990,000
Foreign currency contracts
Unrealized holding losses on cash flow hedges, net of tax	522,000	(30,000)
Deferred tax benefits (liabilities) included in accumulated other comprehensive loss	$ (280,000)	$ 20,000