Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Nov. 30, 2017	Nov. 30, 2016	Nov. 30, 2017	Nov. 30, 2016	Feb. 28, 2017
Components of accumulated other comprehensive loss
Balance			$ 1,173
Tax effects	$ (744)	$ (297)	219	$ (392)
Other comprehensive income (loss)	1,609	1,230	(2,511)	1,422
Balance	(1,338)		(1,338)		$ 1,173
Net deferred tax benefits (expense)	35,404	$ 2,740	54,355	$ 8,713
Interest rate swaps
Components of accumulated other comprehensive loss
Other comprehensive income before reclassification			753
Tax effects			(290)
Other comprehensive income (loss)			463
Balance	463		463
Net deferred tax benefits (expense)			300
Foreign currency contracts
Components of accumulated other comprehensive loss
Balance			1,173
Other comprehensive income before reclassification			(1,275)
Amounts reclassified out of accumulated other comprehensive income			(2,208)
Tax effects			509
Other comprehensive income (loss)			(2,974)
Balance	(1,801)		(1,801)		1,173
Net deferred tax benefits (expense)					(200)
Accumulated other comprehensive income (loss)
Components of accumulated other comprehensive loss
Balance			1,173
Balance	$ (1,338)		(1,338)		$ 1,173
Unrealized Holding Gains (Losses) On Cash Flow Hedges
Components of accumulated other comprehensive loss
Other comprehensive income before reclassification			(522)
Amounts reclassified out of accumulated other comprehensive income			(2,208)
Tax effects			219
Other comprehensive income (loss)			(2,511)
Unrealized Holding Gains (Losses) On Cash Flow Hedges | Foreign currency contracts
Components of accumulated other comprehensive loss
Net deferred tax benefits (expense)			$ 300