Earnings per Share - Basic and Diluted Earnings per Common Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Nov. 30, 2015	Aug. 31, 2015	May. 31, 2015	Feb. 28, 2015	Nov. 30, 2014	Aug. 31, 2014	May. 31, 2014	Feb. 28, 2014	Feb. 28, 2013
Earnings for basic earnings per common share:
Net earnings to common shareholders	$ 19,962	$ 2,057	$ 59,833	$ 11,682	$ (99,759)	$ 83,561	$ 61,326	$ 112,432
Earnings for diluted earnings per common share:
Net earnings to common shareholders	$ 19,962	$ 2,057	$ 59,833	$ 11,682	$ (99,759)	$ 83,561	$ 61,326	$ 112,432
Predecessor [Member]
Earnings for basic earnings per common share:
Net earnings									$ 90,842
Net earnings to noncontrolling interests									10,704
Net earnings to common shareholders									80,138
Less: Allocation of earnings to participating securities									5,890
Net earnings available to common shareholders									$ 74,248
Basic (USD per share)									$ 0.35
Earnings for diluted earnings per common share:
Net earnings									$ 90,842
Net earnings to noncontrolling interests									10,704
Net earnings to common shareholders									80,138
Add: Mandatorily redeemable convertible preferred stock dividends									1,016
Less: Allocation of earnings to participating securities									5,882
Net earnings available to common shareholders									$ 75,272
Shares:
Average common shares used in basic computation (in shares)									213,732
Stock options (in shares)									2
Mandatorily redeemable convertible preferred stock (in shares)									4,110
Average common shares used in diluted computation (in shares)									217,844
Diluted (USD per share)									$ 0.35
Dividends:
Dividends declared per common share (USD per share)									$ 0.075