Retirement Plans (Details 2) (Recurring, USD $) In Thousands, unless otherwise specified	Feb. 28, 2015	Mar. 01, 2014
Fair Value
Fair Value Measurements
Total assets at fair value	$ 129,934	$ 128,984
Fair Value | International equity
Fair Value Measurements
Total assets at fair value	17,071	20,401
Fair Value | Large Cap
Fair Value Measurements
Total assets at fair value	35,524	40,913
Fair Value | Small-Mid Cap
Fair Value Measurements
Total assets at fair value	15,977	18,071
Fair Value | Long Term Credit Bond Index
Fair Value Measurements
Total assets at fair value	47,249	47,360
Fair Value | Intermediate Fixed Income
Fair Value Measurements
Total assets at fair value	13,612
Fair Value | Short Term Investments
Fair Value Measurements
Total assets at fair value	501	2,239
Level 2
Fair Value Measurements
Total assets at fair value	129,934	128,984
Level 2 | International equity
Fair Value Measurements
Total assets at fair value	17,071	20,401
Level 2 | Large Cap
Fair Value Measurements
Total assets at fair value	35,524	40,913
Level 2 | Small-Mid Cap
Fair Value Measurements
Total assets at fair value	15,977	18,071
Level 2 | Long Term Credit Bond Index
Fair Value Measurements
Total assets at fair value	47,249	47,360
Level 2 | Intermediate Fixed Income
Fair Value Measurements
Total assets at fair value	13,612
Level 2 | Short Term Investments
Fair Value Measurements
Total assets at fair value	$ 501	$ 2,239