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Fair Value (Details 2) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Jul. 28, 2013
Apr. 28, 2013
Financial assets:    
Marketable securities $ 27,320 $ 25,520
Restricted cash and investments 9,757 11,417
Financial liabilities:    
Other long-term obligations 22,756 22,514
Transfers between Level 1 and Level 2 inputs for marketable securities 0  
Transfers between Level 1 and Level 2 inputs for restricted cash and investments 0  
Level 1
   
Financial assets:    
Marketable securities 8,465 9,433
Restricted cash and investments 3,663 3,979
Level 2
   
Financial assets:    
Marketable securities 18,855 16,087
Restricted cash and investments 6,094 7,438
Carrying Amount
   
Financial assets:    
Cash and cash equivalents 66,560 68,469
Marketable securities 27,320 25,520
Accounts receivable 10,688 11,077
Restricted cash and investments 9,757 11,417
Notes receivable 56 56
Financial liabilities:    
Other long-term obligations 22,756 22,514
Carrying Amount | Revolving line of credit
   
Financial liabilities:    
Long-term debt 169,800 154,900
Carrying Amount | 5.875% Senior notes
   
Financial liabilities:    
Long-term debt 350,000 350,000
Carrying Amount | 7.75% Senior notes
   
Financial liabilities:    
Long-term debt 298,305 298,246
Carrying Amount | 8.875% Senior Subordinated notes
   
Financial liabilities:    
Long-term debt 350,000 350,000
Carrying Amount | Other long-term debt
   
Financial liabilities:    
Long-term debt 3,486 3,738
Fair Value
   
Financial assets:    
Cash and cash equivalents 66,560 68,469
Marketable securities 27,320 25,520
Accounts receivable 10,688 11,077
Restricted cash and investments 9,757 11,417
Notes receivable 56 56
Financial liabilities:    
Other long-term obligations 22,756 22,514
Fair Value | Revolving line of credit
   
Financial liabilities:    
Long-term debt 166,404 151,802
Fair Value | 5.875% Senior notes
   
Financial liabilities:    
Long-term debt 341,250 357,000
Fair Value | 7.75% Senior notes
   
Financial liabilities:    
Long-term debt 313,220 327,698
Fair Value | 8.875% Senior Subordinated notes
   
Financial liabilities:    
Long-term debt 375,375 381,535
Fair Value | Other long-term debt
   
Financial liabilities:    
Long-term debt $ 3,486 $ 3,738