Fair Value (Table 1) (Details) (Fair Value, Measurements, Recurring [Member], USD $) In Thousands, unless otherwise specified	Apr. 28, 2012
Company's assets measured at fair value
Money market funds	$ 0
ARS - available-for-sale - student loan backed	22,289
ARS - available-for-sale - municipal authority bonds	15,613
Municipal notes and bonds held in the Rabbi Trust	0
Derivative financial instruments	5,597
Total assets measured at fair value	43,499
Derivative financial instruments	2,632
Total liabilities measured at fair value	2,632
Level 1 [Member]
Company's assets measured at fair value
Money market funds	0
ARS - available-for-sale - student loan backed	0
ARS - available-for-sale - municipal authority bonds	0
Municipal notes and bonds held in the Rabbi Trust	0
Derivative financial instruments	0
Total assets measured at fair value	0
Derivative financial instruments	0
Total liabilities measured at fair value	0
Level 2 [Member]
Company's assets measured at fair value
Money market funds	0
ARS - available-for-sale - student loan backed	0
ARS - available-for-sale - municipal authority bonds	0
Municipal notes and bonds held in the Rabbi Trust	0
Derivative financial instruments	5,597
Total assets measured at fair value	5,597
Derivative financial instruments	2,632
Total liabilities measured at fair value	2,632
Level 3 [Member]
Company's assets measured at fair value
Money market funds	0
ARS - available-for-sale - student loan backed	22,289
ARS - available-for-sale - municipal authority bonds	15,613
Municipal notes and bonds held in the Rabbi Trust	0
Derivative financial instruments	0
Total assets measured at fair value	37,902
Derivative financial instruments	0
Total liabilities measured at fair value	$ 0