Financial Instruments and Risk Management (Details 3) (Designated as cash flow hedging instruments, USD $) In Thousands, unless otherwise specified	May 31, 2012	Feb. 29, 2012
Accrued Expenses and Other Current Liabilities
Fair values of derivative instruments in the consolidated balance sheet
Derivative Liabilities	$ 3,464	$ 3,694
Other Liabilities, Noncurrent
Fair values of derivative instruments in the consolidated balance sheet
Derivative Liabilities	4,207	5,022
Prepaid Expenses and Other Current Assets
Fair values of derivative instruments in the consolidated balance sheet
Derivative assets	382
Foreign currency contracts | Canadian
Fair values of derivative instruments in the consolidated balance sheet
Notional Amount	7,000	7,000
Foreign currency contracts | Canadian | Accrued Expenses and Other Current Liabilities
Fair values of derivative instruments in the consolidated balance sheet
Derivative Liabilities		163
Foreign currency contracts | Canadian | Prepaid Expenses and Other Current Assets
Fair values of derivative instruments in the consolidated balance sheet
Derivative assets	120
Foreign currency contracts | Pounds
Fair values of derivative instruments in the consolidated balance sheet
Notional Amount	5,750
Foreign currency contracts | Euros | Prepaid Expenses and Other Current Assets
Fair values of derivative instruments in the consolidated balance sheet
Derivative assets	262
Interest rate swaps
Fair values of derivative instruments in the consolidated balance sheet
Notional Amount	75,000	75,000
Interest rate swaps | Accrued Expenses and Other Current Liabilities
Fair values of derivative instruments in the consolidated balance sheet
Derivative Liabilities	3,464	3,531
Interest rate swaps | Other Liabilities, Noncurrent
Fair values of derivative instruments in the consolidated balance sheet
Derivative Liabilities	$ 4,207	$ 5,022