Fair Value Measurements - Assets Measured at Fair Value as of Measurement Date (Detail) (Fair Value, Measurements, Recurring [Member], Deferred Compensation Plan Assets [Member], USD $) In Thousands, unless otherwise specified	May 31, 2013	Feb. 28, 2013	May 25, 2012
Assets measured on a recurring and non-recurring basis:
Assets measured on a recurring basis	$ 11,104	$ 10,636	$ 9,505
Level 1 [Member]
Assets measured on a recurring and non-recurring basis:
Assets measured on a recurring basis	8,683	9,175	7,949
Level 2 [Member]
Assets measured on a recurring and non-recurring basis:
Assets measured on a recurring basis	2,421	1,461	1,556
Level 3 [Member]
Assets measured on a recurring and non-recurring basis:
Assets measured on a recurring basis