Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	Aug. 31, 2013	Mar. 02, 2013
Cash equivalents
Total cash equivalents	$ 26,769	$ 17,639
Available for sale securities
Available-for-sale Securities	26,271	38,814
Restricted investments
Total restricted investments	6,590	26,443
Mutual fund investments
Total mutual fund investments	747	251
Total assets at fair value	60,377	83,147
Foreign Currency Derivatives [Abstract]
Foreign Currency Contracts, Liability, Fair Value Disclosure	184	405
Liabilities, Fair Value Disclosure	184	405
Money market funds [Member]
Cash equivalents
Total cash equivalents	26,769	17,639
Restricted investments
Total restricted investments	6,590	26,443
Municipal bonds [Member]
Available for sale securities
Available-for-sale Securities	26,271	38,814
Mutual funds [Member]
Mutual fund investments
Total mutual fund investments	747	251
Quoted Prices in Active Markets (Level 1) [Member]
Cash equivalents
Total cash equivalents	26,769	17,639
Available for sale securities
Available-for-sale Securities	0	0
Restricted investments
Total restricted investments	6,590	26,443
Mutual fund investments
Total mutual fund investments	747	251
Total assets at fair value	34,106	44,333
Foreign Currency Derivatives [Abstract]
Foreign Currency Contracts, Liability, Fair Value Disclosure	0	0
Liabilities, Fair Value Disclosure	0	0
Quoted Prices in Active Markets (Level 1) [Member] | Money market funds [Member]
Cash equivalents
Total cash equivalents	26,769	17,639
Restricted investments
Total restricted investments	6,590	26,443
Quoted Prices in Active Markets (Level 1) [Member] | Municipal bonds [Member]
Available for sale securities
Available-for-sale Securities	0	0
Quoted Prices in Active Markets (Level 1) [Member] | Mutual funds [Member]
Mutual fund investments
Total mutual fund investments	747	251
Other Observable Inputs (Level 2) [Member]
Cash equivalents
Total cash equivalents	0	0
Available for sale securities
Available-for-sale Securities	26,271	38,814
Restricted investments
Total restricted investments	0	0
Mutual fund investments
Total mutual fund investments	0	0
Total assets at fair value	26,271	38,814
Foreign Currency Derivatives [Abstract]
Foreign Currency Contracts, Liability, Fair Value Disclosure	184	405
Liabilities, Fair Value Disclosure	184	405
Other Observable Inputs (Level 2) [Member] | Money market funds [Member]
Cash equivalents
Total cash equivalents	0	0
Restricted investments
Total restricted investments	0	0
Other Observable Inputs (Level 2) [Member] | Municipal bonds [Member]
Available for sale securities
Available-for-sale Securities	26,271	38,814
Other Observable Inputs (Level 2) [Member] | Mutual funds [Member]
Mutual fund investments
Total mutual fund investments	0	0
Unobservable Inputs (Level 3) [Member]
Cash equivalents
Total cash equivalents	0	0
Available for sale securities
Available-for-sale Securities	0	0
Restricted investments
Total restricted investments	0	0
Mutual fund investments
Total mutual fund investments	0	0
Total assets at fair value	0	0
Foreign Currency Derivatives [Abstract]
Foreign Currency Contracts, Liability, Fair Value Disclosure	0	0
Liabilities, Fair Value Disclosure	0	0
Unobservable Inputs (Level 3) [Member] | Money market funds [Member]
Cash equivalents
Total cash equivalents	0	0
Restricted investments
Total restricted investments	0	0
Unobservable Inputs (Level 3) [Member] | Municipal bonds [Member]
Available for sale securities
Available-for-sale Securities	0	0
Unobservable Inputs (Level 3) [Member] | Mutual funds [Member]
Mutual fund investments
Total mutual fund investments	$ 0	$ 0