Common Shares and Stock-Based Compensation - Summary of Incremental Compensation Expense and Capital in Excess of Par Value (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Feb. 28, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incremental compensation expense	$ 10,601
Incremental capital in excess of par value	(13,721)
Settlement Of Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incremental compensation expense	3,226
Incremental capital in excess of par value	(3,933)
Modification And Settlement Of Non Executive Directors Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incremental compensation expense	512
Incremental capital in excess of par value	(371)
Net Tax Deficiency From Settlement And Cancellation Of Stock-Based Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incremental capital in excess of par value	(6,885)
Conversion Of Performance Share And Restricted Stock Awards To Cash Based Liability Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incremental compensation expense	2,897
Incremental capital in excess of par value	(6,498)
Cancellation Of Family Shareholders Performance Share And Restricted Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incremental compensation expense	3,966
Incremental capital in excess of par value	$ 3,966