Accumulated Other Comprehensive Loss (Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Nov. 30, 2016	Nov. 30, 2015	Nov. 30, 2016	Nov. 30, 2015
Schedule of Accumulated Other Comprehensive Loss [Line Items]
Beginning balance			$ (70,196)
Other comprehensive income before reclassifications			3,936
Amounts reclassified from accumulated other comprehensive loss			6,125
Other comprehensive income (loss)	$ 6,447	$ (515)	10,061	$ (1,273)
Ending balance	(60,135)		(60,135)
Net Unrecognized Actuarial Losses
Schedule of Accumulated Other Comprehensive Loss [Line Items]
Beginning balance			(56,470)
Other comprehensive income before reclassifications			0
Amounts reclassified from accumulated other comprehensive loss			744
Other comprehensive income (loss)			744
Ending balance	(55,726)		(55,726)
Net Unrecognized Hedge Losses
Schedule of Accumulated Other Comprehensive Loss [Line Items]
Beginning balance			(13,726)
Other comprehensive income before reclassifications			3,936
Amounts reclassified from accumulated other comprehensive loss			5,381
Other comprehensive income (loss)			9,317
Ending balance	$ (4,409)		$ (4,409)