Retirement and Postretirement Benefit Plans - Summary of Amounts Recognized Consolidated Statement of Financial Position (Detail) (USD $) In Thousands, unless otherwise specified	Feb. 28, 2013	Feb. 29, 2012
Pension Plans [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Accrued compensation and benefits	$ (2,267)	$ (2,257)
Other liabilities	(81,358)	(75,746)
Net amount recognized	(83,625)	(78,003)
Amounts recognized in accumulated other comprehensive loss (income):
Net actuarial loss (gain)	71,385	69,632
Net prior service cost (credit)	1,522	1,531
Net transition obligation	30	37
Accumulated other comprehensive loss (income)	72,937	71,200
Postretirement Benefit Plans [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Other liabilities	(15,658)	(24,781)
Net amount recognized	(15,658)	(24,781)
Amounts recognized in accumulated other comprehensive loss (income):
Net actuarial loss (gain)	(16,397)	(3,081)
Net prior service cost (credit)	(6,780)	(8,855)
Accumulated other comprehensive loss (income)	$ (23,177)	$ (11,936)