Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	Nov. 30, 2013	Mar. 02, 2013
Cash equivalents
Total cash equivalents	$ 9,147	$ 17,639
Available for sale securities
Available-for-sale Securities	13,792	38,814
Restricted investments
Total restricted investments	23,678	26,443
Mutual fund investments
Total mutual fund investments	841	251
Derivative Instruments and Hedges, Assets [Abstract]
Foreign Currency Contract, Asset, Fair Value Disclosure	205
Total assets at fair value	47,663	83,147
Derivative Instruments and Hedges, Liabilities [Abstract]
Liabilities, Fair Value Disclosure		405
Money market funds [Member]
Cash equivalents
Total cash equivalents	9,147	17,639
Restricted investments
Total restricted investments	23,678	26,443
Municipal bonds [Member]
Available for sale securities
Available-for-sale Securities	13,792	38,814
Mutual funds [Member]
Mutual fund investments
Total mutual fund investments	841	251
Foreign Exchange Contract [Member]
Derivative Instruments and Hedges, Assets [Abstract]
Foreign Currency Contract, Asset, Fair Value Disclosure	205
Derivative Instruments and Hedges, Liabilities [Abstract]
Foreign Currency Contracts, Liability, Fair Value Disclosure		405
Quoted Prices in Active Markets (Level 1) [Member]
Cash equivalents
Total cash equivalents	9,147	17,639
Available for sale securities
Available-for-sale Securities	0	0
Restricted investments
Total restricted investments	23,678	26,443
Mutual fund investments
Total mutual fund investments	841	251
Derivative Instruments and Hedges, Assets [Abstract]
Foreign Currency Contract, Asset, Fair Value Disclosure	0
Total assets at fair value	33,666	44,333
Derivative Instruments and Hedges, Liabilities [Abstract]
Liabilities, Fair Value Disclosure		0
Quoted Prices in Active Markets (Level 1) [Member] | Money market funds [Member]
Cash equivalents
Total cash equivalents	9,147	17,639
Restricted investments
Total restricted investments	23,678	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	841	251
Quoted Prices in Active Markets (Level 1) [Member] | Foreign Exchange Contract [Member]
Derivative Instruments and Hedges, Assets [Abstract]
Foreign Currency Contract, Asset, Fair Value Disclosure	0
Derivative Instruments and Hedges, Liabilities [Abstract]
Foreign Currency Contracts, Liability, Fair Value Disclosure		0
Other Observable Inputs (Level 2) [Member]
Cash equivalents
Total cash equivalents	0	0
Available for sale securities
Available-for-sale Securities	13,792	38,814
Restricted investments
Total restricted investments	0	0
Mutual fund investments
Total mutual fund investments	0	0
Derivative Instruments and Hedges, Assets [Abstract]
Foreign Currency Contract, Asset, Fair Value Disclosure	205
Total assets at fair value	13,997	38,814
Derivative Instruments and Hedges, Liabilities [Abstract]
Liabilities, Fair Value Disclosure		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	13,792	38,814
Other Observable Inputs (Level 2) [Member] | Mutual funds [Member]
Mutual fund investments
Total mutual fund investments	0	0
Other Observable Inputs (Level 2) [Member] | Foreign Exchange Contract [Member]
Derivative Instruments and Hedges, Assets [Abstract]
Foreign Currency Contract, Asset, Fair Value Disclosure	205
Derivative Instruments and Hedges, Liabilities [Abstract]
Foreign Currency Contracts, Liability, Fair Value Disclosure		405
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
Derivative Instruments and Hedges, Assets [Abstract]
Foreign Currency Contract, Asset, Fair Value Disclosure	0
Total assets at fair value	0	0
Derivative Instruments and Hedges, Liabilities [Abstract]
Liabilities, Fair Value Disclosure		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
Unobservable Inputs (Level 3) [Member] | Foreign Exchange Contract [Member]
Derivative Instruments and Hedges, Assets [Abstract]
Foreign Currency Contract, Asset, Fair Value Disclosure	0
Derivative Instruments and Hedges, Liabilities [Abstract]
Foreign Currency Contracts, Liability, Fair Value Disclosure		$ 0