Retirement and Postretirement Benefit Plans - Additional Information (Detail) (USD $) In Thousands, except Share data in Millions, unless otherwise specified	12 Months Ended
	Feb. 28, 2013 Plans	Feb. 29, 2012	Feb. 28, 2011
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Total pension expense for the multiemployer plan	$ 544	$ 513	$ 467
Common shares in the trust	0.2	0.2
Value of the common shares	3,143	2,772
Number of unfunded plans	2
Profit-sharing plan [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Corporate contributions to the profit sharing plan	7,536	9,401	9,759
Defined contribution plans [Member] | Domestic [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Corporate contributions to the profit sharing plan	6,273	5,976	4,875
Defined contribution plans [Member] | U K Subsidiary [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Corporate contributions to the profit sharing plan	1,970	2,012	1,226
Pension Plans [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Amortization of estimated net loss	3,610
Amortization of prior service cost	195
Amortization of transition obligation	6
Postretirement Benefit Plans [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Amortization of estimated net loss	(870)
Amortization of prior service cost	(1,300)
Expected long-term rate of return	6.50%
Estimated future employer contribution	250
Credit rating of 'A' [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Maturity of debt securities	2 years 6 months
Supplemental Executive Retirement Plan in 2014 [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Estimated future employer contribution	$ 2,100