Retirement and Postretirement Benefits Plans - Components of Net Periodic Benefit Cost and Changes Recognized Other Comprehensive Income, Defined Benefit Pension Plan (Detail) - Defined Benefit Pension Plans [Member] - USD ($) $ in Thousands	12 Months Ended
	Feb. 29, 2016	Feb. 28, 2015	Feb. 28, 2014
Components of net periodic benefit cost:
Service cost	$ 710	$ 683	$ 1,115
Interest cost	6,186	7,249	7,065
Expected return on plan assets	(6,581)	(6,522)	(6,267)
Amortization of transition obligation	4	5	6
Amortization of prior service cost		580	190
Amortization of actuarial loss	3,402	2,827	3,485
Recognition of prior service cost upon curtailment			1,746
Net periodic benefit cost	3,721	4,822	7,340
Other changes in plan assets and benefit obligations recognized in other comprehensive income:
Actuarial loss	4,749	8,610	941
Prior service cost		580	414
Amortization of prior service cost		(580)	(190)
Amortization of actuarial loss	(3,402)	(2,827)	(3,485)
Amortization of transition obligation	(4)	(5)	(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	1,343	5,778	(8,623)
Total recognized in net periodic benefit cost and other comprehensive income	$ 5,064	$ 10,600	$ (1,283)