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Fair Value (Details 2) (USD $)
In Thousands, unless otherwise specified
Apr. 28, 2013
Apr. 29, 2012
Financial assets:    
Marketable securities $ 25,520 $ 24,943
Restricted cash and investments 11,417 12,551
Financial liabilities:    
Other long-term obligations 22,514 16,556
Transfers between Level 1 and Level 2 inputs 0  
Level 1
   
Financial assets:    
Marketable securities 9,256  
Level 2
   
Financial assets:    
Marketable securities 16,164  
Carrying Amount
   
Financial assets:    
Cash and cash equivalents 68,469 94,461
Marketable securities 25,520 24,943
Accounts receivable 11,077 6,941
Restricted cash and investments 11,417 12,551
Notes receivable 56 1,293
Financial liabilities:    
Other long-term obligations 22,514 16,556
Carrying Amount | Revolving line of credit
   
Financial liabilities:    
Long-term debt 154,900  
Carrying Amount | Variable rate term loans
   
Financial liabilities:    
Long-term debt   495,000
Carrying Amount | 7.75% Senior notes
   
Financial liabilities:    
Long-term debt 298,246 298,026
Carrying Amount | 5.875% Senior Notes
   
Financial liabilities:    
Long-term debt 350,000  
Carrying Amount | 8.875% Senior Subordinated Notes
   
Financial liabilities:    
Long-term debt 350,000  
Carrying Amount | 7% Senior subordinated notes
   
Financial liabilities:    
Long-term debt   357,275
Carrying Amount | Other long-term debt
   
Financial liabilities:    
Long-term debt 3,738 4,130
Fair Value
   
Financial assets:    
Cash and cash equivalents 68,469 94,461
Marketable securities 25,520 24,943
Accounts receivable 11,077 6,941
Restricted cash and investments 11,417 12,551
Notes receivable 56 1,293
Financial liabilities:    
Other long-term obligations 22,514 16,556
Fair Value | Revolving line of credit
   
Financial liabilities:    
Long-term debt 151,802  
Fair Value | Variable rate term loans
   
Financial liabilities:    
Long-term debt   498,713
Fair Value | 7.75% Senior notes
   
Financial liabilities:    
Long-term debt 327,698 308,829
Fair Value | 5.875% Senior Notes
   
Financial liabilities:    
Long-term debt 357,000  
Fair Value | 8.875% Senior Subordinated Notes
   
Financial liabilities:    
Long-term debt 381,535  
Fair Value | 7% Senior subordinated notes
   
Financial liabilities:    
Long-term debt   358,168
Fair Value | Other long-term debt
   
Financial liabilities:    
Long-term debt $ 3,738 $ 4,130