Retirement and Postretirement Benefit Plans - Summary of Amounts Recognized on Consolidated Statement of Financial Position (Detail) (USD $) In Thousands, unless otherwise specified	Feb. 28, 2015	Feb. 28, 2014
Defined Benefit Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Accrued compensation and benefits	$ (2,639)	$ (2,624)
Other liabilities	(81,861)	(77,268)
Net amount recognized	(84,500)	(79,892)
Amounts recognized in accumulated other comprehensive (income) loss
Net actuarial loss (gain)	68,372	63,614
Net transition obligation	16	23
Accumulated other comprehensive loss (income)	68,388	63,637
Postretirement Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Other liabilities	(17,542)	(17,875)
Net amount recognized	(17,542)	(17,875)
Amounts recognized in accumulated other comprehensive (income) loss
Net actuarial loss (gain)	(19,396)	(17,013)
Net prior service cost (credit)	(4,173)	(5,477)
Accumulated other comprehensive loss (income)	$ (23,569)	$ (22,490)