Fair Value Measurements - Assets and Liabilities Measured at Fair Value as of Measurement Date (Detail) (Fair Value, Measurements, Recurring [Member], USD $) In Thousands, unless otherwise specified	Feb. 28, 2014	Feb. 28, 2013
Deferred Compensation Plan Assets [Member]
Assets measured on a recurring basis:
Assets measured on a recurring basis	$ 12,285	$ 10,636
Deferred Compensation Plan Liabilities [Member]
Liabilities measured on a recurring basis:
Liabilities measured on a recurring basis	13,230	10,636
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Deferred Compensation Plan Assets [Member]
Assets measured on a recurring basis:
Assets measured on a recurring basis	10,289	9,175
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Deferred Compensation Plan Liabilities [Member]
Liabilities measured on a recurring basis:
Liabilities measured on a recurring basis	10,289	9,175
Level 2 [Member] | Deferred Compensation Plan Assets [Member]
Assets measured on a recurring basis:
Assets measured on a recurring basis	1,996	1,461
Level 2 [Member] | Deferred Compensation Plan Liabilities [Member]
Liabilities measured on a recurring basis:
Liabilities measured on a recurring basis	2,941	1,461
Level 3 [Member] | Deferred Compensation Plan Assets [Member]
Assets measured on a recurring basis:
Assets measured on a recurring basis
Level 3 [Member] | Deferred Compensation Plan Liabilities [Member]
Liabilities measured on a recurring basis:
Liabilities measured on a recurring basis