Debt - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Feb. 29, 2016	Feb. 28, 2015	Feb. 28, 2014	Aug. 09, 2013
Debt Disclosure [Line Items]
Interest paid in cash on debt	$ 24,275	$ 31,331	$ 46,869
Non Publicly Traded [Member] | Level 2 [Member]
Debt Disclosure [Line Items]
Total fair value of non-publicly traded debt	185,000	251,789
Carrying value of Corporation's non-publicly traded debt	$ 185,000	$ 254,300
Term Loan Facility [Member]
Debt Disclosure [Line Items]
Interest on credit facility borrowings	2.90%
Current borrowing capacity				$ 350,000
Letters of Credit [Member]
Debt Disclosure [Line Items]
Current borrowing capacity	$ 148,800
Amount of letters of credit outstanding under revolving credit facilities	$ 26,490