Retirement and Postretirement Benefits Plans - Components of Net Periodic Benefit Cost and Changes Recognized Other Comprehensive Income, Defined Benefit Pension Plans (Detail) (Defined Benefit Pension Plans [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Feb. 28, 2014	Feb. 28, 2013	Feb. 29, 2012
Defined Benefit Pension Plans [Member]
Components of net periodic benefit cost:
Service cost	$ 1,115	$ 1,369	$ 1,106
Interest cost	7,065	7,394	8,353
Expected return on plan assets	(6,267)	(6,473)	(6,858)
Amortization of transition obligation	6	7	6
Amortization of prior service cost	190	240	240
Amortization of actuarial loss	3,485	3,514	2,126
Recognition of prior service cost upon curtailment	1,746
Net periodic benefit cost	7,340	6,051	4,973
Other changes in plan assets and benefit obligations recognized in other comprehensive income:
Actuarial loss	941	5,657	14,996
Prior service cost	414	231	924
Amortization of prior service cost	(190)	(240)	(240)
Amortization of actuarial loss	(3,485)	(3,514)	(2,126)
Amortization of transition obligation	(6)	(7)	(6)
Change in control	2,613
Curtailment gain	(7,164)
Recognition of prior service cost upon curtailment	(1,746)
Total recognized in other comprehensive income	(8,623)	2,127	13,548
Total recognized in net periodic benefit cost and other comprehensive income	$ (1,283)	$ 8,178	$ 18,521