Retirement and Postretirement Benefit Plans - Summary of Amounts Recognized Consolidated Statement of Financial Position (Detail) (USD $) In Thousands, unless otherwise specified	Feb. 28, 2014	Feb. 28, 2013
Defined Benefit Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Accrued compensation and benefits	$ (2,624)	$ (2,267)
Other liabilities	(77,268)	(81,358)
Net amount recognized	(79,892)	(83,625)
Amounts recognized in accumulated other comprehensive (income) loss
Net actuarial loss (gain)	63,614	71,385
Net prior service cost (credit)		1,522
Net transition obligation	23	30
Accumulated other comprehensive loss (income)	63,637	72,937
Postretirement Benefits Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Other liabilities	(17,875)	(15,658)
Net amount recognized	(17,875)	(15,658)
Amounts recognized in accumulated other comprehensive (income) loss
Net actuarial loss (gain)	(17,013)	(16,397)
Net prior service cost (credit)	(5,477)	(6,780)
Net transition obligation
Accumulated other comprehensive loss (income)	$ (22,490)	$ (23,177)