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Long-Term Debt - Additional Information (Details) - USD ($)
12 Months Ended
Apr. 15, 2015
Jun. 27, 2015
Apr. 14, 2015
Jun. 28, 2014
Debt Instrument [Line Items]        
Actual Min Net Worth   $ 379,953,000    
Unsecured private placement notes        
Debt Instrument [Line Items]        
Notes payable   $ 75,000,000   $ 75,000,000
Effective interest rate   0.873%    
Long-term debt, notes   $ 75,000    
Senior Notes        
Debt Instrument [Line Items]        
Effective interest rate   3.81%    
Long-term debt, notes   $ 100,000,000    
Notes payable, outstanding balance   100,000,000   100,000,000
Senior Notes | Unsecured Senior Notes 1        
Debt Instrument [Line Items]        
Long-term debt, notes   $ 50,000,000    
Interest rate, stated percentage   3.73%    
Senior Notes | Unsecured Senior Notes 2        
Debt Instrument [Line Items]        
Long-term debt, notes   $ 50,000,000    
Interest rate, stated percentage   3.88%    
Unsecured Revolving Credit Facility        
Debt Instrument [Line Items]        
Revolving credit facility $ 350,000   $ 250,000  
Line of credit facility, term 5 years      
Line of credit, Additional Borrowing Capacity $ 200,000      
Maximum borrowing capacity, including additional borrowing capacity $ 550,000      
Outstanding letters of credit   $ 636,000    
Effective interest rate   1.438%    
Fee payment on unused credit balances, percentage   0.175%    
Borrowings outstanding under the revolving credit facility   $ 40,500,000   65,925,000
Letter of Credit        
Debt Instrument [Line Items]        
Revolving credit facility   45,000    
Secured Debt        
Debt Instrument [Line Items]        
Revolving credit facility   50,000,000    
Outstanding letters of credit   $ 21,900,000    
Interest rate on letters of credit outstanding   0.80%    
Fee payment on unused credit balances, percentage   0.26%    
Borrowings outstanding under the revolving credit facility   $ 28,100,000   $ 25,075,000
Secured Revolving Credit Facility        
Debt Instrument [Line Items]        
Effective interest rate   0.93%    
London Interbank Offered Rate (LIBOR) | Unsecured private placement notes        
Debt Instrument [Line Items]        
Interest rate spread on notes   0.60%    
London Interbank Offered Rate (LIBOR) | Secured Debt        
Debt Instrument [Line Items]        
Interest rate spread on notes   0.75%    
London Interbank Offered Rate (LIBOR) | Maximum | Unsecured Revolving Credit Facility        
Debt Instrument [Line Items]        
Interest rate spread on notes 1.75%      
London Interbank Offered Rate (LIBOR) | Minimum | Unsecured Revolving Credit Facility        
Debt Instrument [Line Items]        
Interest rate spread on notes 1.00%