Common Shares and Stock-Based Compensation - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Feb. 28, 2014	Feb. 28, 2013	Feb. 29, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares outstanding	100
Settlement of stock options in excess of fair value	$ 10,601
Performance shares granted	Equally divided into three tranches
Compensation cost recognized	5,721
Stock-based compensation	8,091	10,743	10,982
Stock compensation expense	4,125	10,743	10,982
Cash received from stock options exercised	1,718	1,259	13,310
Total intrinsic value of options exercised	6,298	7,423	17,117
Actual tax benefit realized from the exercise of stock-based payment arrangements	2,486	2,929	6,705
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of performance achievement	0.00%
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of performance achievement	200.00%
Tranche 1 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance shares granted	March 1, 2012 to February 28, 2013
Tranche 2 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance shares granted	March 1, 2012 to February 28, 2014
Tranche 3 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance shares granted	March 1, 2012 to February 28, 2015
Restricted stock units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of restricted stock unit	$ 19.00
Compensation cost recognized	464
Incremental stock based compensation expense	512
Period required for the shares to continuing service	Two or three-year
Cancellation Of Family Shareholders Performance Share And Restricted Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Settlement of stock options in excess of fair value	3,966
Incremental compensation expense	3,966
Family Shareholders [Member] | Performance shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incremental stock based compensation expense	2,603
Family Shareholders [Member] | Restricted stock units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incremental stock based compensation expense	1,363
Performance shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost recognized	1,545
Performance shares [Member] | Restricted stock units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of restricted stock unit	$ 19.00
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period of commencement of option exercisable	Twelve months after the date of grant
Period of expiration of stock option	Not more than ten years
Stock options settled through cash payments	7,159
Stock options settled at fair value	3,933
Settlement of stock options in excess of fair value	3,226
Administrative and General Expenses [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	13,812	10,743	10,982
Common Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares authorized	100
Stock compensation expense
Common Shares - Class A [Member] | Family Shareholders [Member] | Performance shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares canceled	9,328
Common Shares - Class A [Member] | Family Shareholders [Member] | Restricted stock units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares canceled	3,871
Common Shares - Class A [Member] | Stock Options [Member] | Family Shareholders [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options cancellation	24,500
Common Shares - Class B [Member] | Family Shareholders [Member] | Performance shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares canceled	354,464
Common Shares - Class B [Member] | Family Shareholders [Member] | Restricted stock units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares canceled	126,804
Common Shares - Class B [Member] | Stock Options [Member] | Family Shareholders [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options cancellation	857,581