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Long-Term Debt, Capital Leases And Financing Obligations (Narrative) (Details)
 12 Months Ended
Mar. 31, 2018
USD ($)
entity
Mar. 25, 2017
USD ($)
Debt Instrument [Line Items]    
Net availability under the credit facility $ 422,600,000  
Carrying amount of long-term debt (including current portion) 148,108,000 $ 182,400,000
Fair value of long-term debt (including current portion) 148,100,000 182,400,000
The total amount financed for properties with capital leases and financing obligations 246,200,000  
Note payable, non-interest bearing, due in equal installments through September 2019 80,000 $ 60,000
Revolving Credit Facility, January 2016 [Member]    
Debt Instrument [Line Items]    
Revolving credit facility agreement $ 600,000,000  
Interest rate over LIBOR on the facility 1.25% 1.00%
Revolving credit facility agreement term 5 years  
Revolving credit facility agreement, number of participating banks | entity 8  
Provision allowing to expand the amount of overall facility $ 100,000,000  
Amount outstanding under Credit Facility [1] 148,028,000 $ 182,297,000
Standby Letters of Credit [Member]    
Debt Instrument [Line Items]    
Line of credit sub-facility for issuing standby letters of credit 80,000,000  
Letters of credit outstanding $ 29,400,000  
Minimum [Member] | Revolving Credit Facility, January 2016 [Member]    
Debt Instrument [Line Items]    
Interest rate over LIBOR on the facility 0.75%  
Percentage of face amount of standby letter of credit payable as fees 0.15%  
Minimum [Member] | Standby Letters of Credit [Member]    
Debt Instrument [Line Items]    
Percentage of face amount of standby letter of credit payable as fees 0.875%  
Maximum [Member]    
Debt Instrument [Line Items]    
Percentage of net income permit as cash dividend, maximum 50.00%  
Maximum [Member] | Revolving Credit Facility, January 2016 [Member]    
Debt Instrument [Line Items]    
Interest rate over LIBOR on the facility 1.75%  
Percentage of face amount of standby letter of credit payable as fees 0.35%  
Maximum [Member] | Standby Letters of Credit [Member]    
Debt Instrument [Line Items]    
Percentage of face amount of standby letter of credit payable as fees 1.875%  
[1] The London Interbank Offered Rate (LIBOR) at March 31, 2018 was 1.88%.