Amounts Recognized in Accumulated Other Comprehensive Loss (Detail) (USD $) In Thousands, unless otherwise specified	Feb. 28, 2013	Feb. 29, 2012
Pension Plans, Defined Benefit
Amounts Recognized in Accumulated Other Comprehensive Loss
Net (Gain) or Loss	$ 6,494	$ 7,119
Net Amount Recognized	6,494	7,119
Other Postretirement Benefit Plans, Defined Benefit
Amounts Recognized in Accumulated Other Comprehensive Loss
Prior Service Cost (Credit)	(1,341)	(1,617)
Net (Gain) or Loss	1,842	1,875
Net Amount Recognized	$ 501	$ 258

After tax total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s).

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant