Fair Value Measurements - Assets and Liabilities Measured at Fair Value as of Measurement Date (Detail) (Fair Value, Measurements, Recurring, USD $) In Thousands, unless otherwise specified	Nov. 23, 2012		Feb. 29, 2012		Nov. 25, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total					$ 12,031
Deferred Compensation Plan Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured on a recurring basis	10,177	[1]	9,198	[1]	8,719	[1]
Active Employees' Medical Plan Trust Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured on a recurring basis					3,312
Quoted prices in active markets for identical assets and liabilities (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total					12,031
Quoted prices in active markets for identical assets and liabilities (Level 1) [Member] | Deferred Compensation Plan Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured on a recurring basis	10,177	[1]	9,198	[1]	8,719	[1]
Quoted prices in active markets for identical assets and liabilities (Level 1) [Member] | Active Employees' Medical Plan Trust Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured on a recurring basis					$ 3,312

[1] There is an offsetting liability for the obligation to its employees on the Corporation's books.