Retirement Plans (Details 2) (Recurring, USD $) In Thousands, unless otherwise specified	Mar. 03, 2012	Feb. 26, 2011
Significant Observable Inputs (Level 2)
Fair Value Measurements
Total assets at fair value	$ 108,196	$ 94,195
Significant Observable Inputs (Level 2) | International equity
Fair Value Measurements
Total assets at fair value	16,265	13,479
Significant Observable Inputs (Level 2) | Large Cap
Fair Value Measurements
Total assets at fair value	33,350	27,743
Significant Observable Inputs (Level 2) | Mid Cap
Fair Value Measurements
Total assets at fair value	11,765	10,191
Significant Observable Inputs (Level 2) | Small Cap
Fair Value Measurements
Total assets at fair value	3,733	3,434
Significant Observable Inputs (Level 2) | Long Term Credit Bond Index
Fair Value Measurements
Total assets at fair value	42,924	38,514
Significant Observable Inputs (Level 2) | Short Term Investments
Fair Value Measurements
Total assets at fair value	159	834
Total
Fair Value Measurements
Total assets at fair value	108,196	94,195
Total | International equity
Fair Value Measurements
Total assets at fair value	16,265	13,479
Total | Large Cap
Fair Value Measurements
Total assets at fair value	33,350	27,743
Total | Mid Cap
Fair Value Measurements
Total assets at fair value	11,765	10,191
Total | Small Cap
Fair Value Measurements
Total assets at fair value	3,733	3,434
Total | Long Term Credit Bond Index
Fair Value Measurements
Total assets at fair value	42,924	38,514
Total | Short Term Investments
Fair Value Measurements
Total assets at fair value	$ 159	$ 834