Retirement Plans - Fair Value (Details) - Recurring - USD ($) $ in Thousands	Feb. 27, 2016	Feb. 28, 2015
Retirement Plans
Total assets at fair value	$ 110,217	$ 129,934
International equity
Retirement Plans
Total assets at fair value	14,414	17,071
Large Cap
Retirement Plans
Total assets at fair value	28,188	35,524
Small-Mid Cap
Retirement Plans
Total assets at fair value	11,684	15,977
Long Term Credit Bond Index
Retirement Plans
Total assets at fair value	43,130	47,249
20+ Year Treasury STRIPS
Retirement Plans
Total assets at fair value	10,929
Intermediate Fixed Income
Retirement Plans
Total assets at fair value	41	13,612
Short Term Investments
Retirement Plans
Total assets at fair value	1,831	501
Level 2
Retirement Plans
Total assets at fair value	110,217	129,934
Level 2 | International equity
Retirement Plans
Total assets at fair value	14,414	17,071
Level 2 | Large Cap
Retirement Plans
Total assets at fair value	28,188	35,524
Level 2 | Small-Mid Cap
Retirement Plans
Total assets at fair value	11,684	15,977
Level 2 | Long Term Credit Bond Index
Retirement Plans
Total assets at fair value	43,130	47,249
Level 2 | 20+ Year Treasury STRIPS
Retirement Plans
Total assets at fair value	10,929
Level 2 | Intermediate Fixed Income
Retirement Plans
Total assets at fair value	41	13,612
Level 2 | Short Term Investments
Retirement Plans
Total assets at fair value	$ 1,831	$ 501