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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, 2013
Common shares Class A [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Stock option outstanding, Beginning, Shares 3,597,427
Exercised, Shares (117,520)
Expired, Shares (30,480)
Forfeited, Shares (213,474)
Stock option outstanding, Ending, Shares 3,235,953
Exercisable at February 28, 2013 3,235,953
Outstanding ,weighted-Average Exercise Price, Beginning $ 20.96
Exercised,Weighted-Average Exercise Price $ 16.06
Expired,Weighted-Average Exercise Price $ 14.90
Forfeited,Weighted Average Exercise Price $ 23.40
Outstanding ,Weighted Average Exercise price, Ending $ 21.23
Exercisable,Weighted-Average Exercise Price $ 21.23
Outstanding, Weighted-Average Remaining Contractual Term , (in years), Beginning 5 years 2 months 12 days
Outstanding, Weighted-Average Remaining Contractual Term ,(in years), Ending 4 years 3 months 18 days
Exercisable, Weighted-Average Remaining Contractual Term (in years) 4 years 3 months 18 days
Outstanding, Aggregate Intrinsic Value, Beginning $ 3,375
Outstanding, Aggregate Intrinsic Value, Ending 3,352
Exercisable, Aggregate Intrinsic Value 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   
Stock option outstanding, Ending, Shares 857,581
Exercisable at February 28, 2013 821,123
Outstanding ,weighted-Average Exercise Price, Beginning $ 23.06
Exercised,Weighted-Average Exercise Price   
Expired,Weighted-Average Exercise Price   
Forfeited,Weighted Average Exercise Price   
Outstanding ,Weighted Average Exercise price, Ending $ 23.06
Exercisable,Weighted-Average Exercise Price $ 22.99
Outstanding, Weighted-Average Remaining Contractual Term , (in years), Beginning 4 years 8 months 12 days
Outstanding, Weighted-Average Remaining Contractual Term ,(in years), Ending 3 years 8 months 12 days
Exercisable, Weighted-Average Remaining Contractual Term (in years) 3 years 7 months 6 days
Outstanding, Aggregate Intrinsic Value, Beginning 420
Outstanding, Aggregate Intrinsic Value, Ending 489
Exercisable, Aggregate Intrinsic Value $ 489