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Common Shares and Stock-Based Compensation - Stock Option Transactions and Prices (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Feb. 28, 2014
Common Shares - Class A [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Stock option outstanding, Beginning, Shares 3,235,953
Exercised, Shares (136,192)
Expired, Shares (20,300)
Forfeited, Shares (130,115)
Settled, Shares (2,949,346)
Stock option outstanding, Ending, Shares   
Outstanding, Weighted-Average Exercise Price, Beginning $ 21.23
Exercised, Weighted-Average Exercise Price $ 12.61
Expired, Weighted-Average Exercise Price $ 14.92
Forfeited, Weighted Average Exercise Price $ 23.63
Settled, Weighted Average Exercise Price $ 21.57
Outstanding, Weighted-Average Remaining Contractual Term , (in years), Beginning 4 years 3 months 18 days
Outstanding, Aggregate Intrinsic Value, Beginning $ 3,352
Common Shares - Class B [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Stock option outstanding, Beginning, Shares 857,581
Exercised, Shares   
Expired, Shares   
Forfeited, Shares (857,581)
Stock option outstanding, Ending, Shares   
Outstanding, Weighted-Average Exercise Price, Beginning $ 23.06
Exercised, Weighted-Average Exercise Price   
Expired, Weighted-Average Exercise Price   
Forfeited, Weighted Average Exercise Price $ 23.06
Outstanding, Weighted-Average Remaining Contractual Term , (in years), Beginning 3 years 8 months 12 days
Outstanding, Aggregate Intrinsic Value, Beginning $ 489