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Senior Credit Facility - Credit Agreement (Details) - USD ($)
3 Months Ended
Jun. 30, 2018
Dec. 30, 2017
Jul. 01, 2017
Jun. 15, 2017
Feb. 19, 2016
Jun. 30, 2018
Line of Credit Facility [Line Items]            
Unsecured Debt $ 543,000,000 $ 427,500,000 $ 455,000,000     $ 543,000,000
Debt Issuance Costs, Gross (1,600,000) (1,400,000) (1,300,000)     (1,600,000)
Unsecured debt, net of debt issuance costs 541,400,000 426,100,000 453,700,000     541,400,000
Unsecured Debt, Current (25,000,000) (25,000,000) (20,000,000)     (25,000,000)
Long-term Debt, Excluding Current Maturities 516,410,000 401,069,000 433,676,000     516,410,000
Letters of Credit Outstanding, Amount 39,900,000 39,600,000 44,300,000     39,900,000
Term Loan, Maximum Borrowing Capacity       $ 100,000,000 $ 200,000,000  
Senior credit facility, maximum borrowing capacity $ 500,000,000       500,000,000 500,000,000
Swingline Loan, Maximum Borrowing Capacity           $ 50,000,000
Debt instrument, basis spread on variable rate 0.75%          
Commitment fee for unused capacity 0.125%          
Debt Instrument, Interest Rate, Stated Percentage - June 2017 Term Loan 1.00%         1.00%
Compensating Balance, Amount $ 0         $ 0
Debt Instrument, Covenant Compliance all          
Base Rate            
Line of Credit Facility [Line Items]            
Line of Credit Facility, Interest Rate at Period End 5.00%         5.00%
London Interbank Offered Rate (LIBOR)            
Line of Credit Facility [Line Items]            
Line of Credit Facility, Interest Rate at Period End 2.09%         2.09%
Minimum            
Line of Credit Facility [Line Items]            
Debt instrument, basis spread on variable rate           0.50%
Commitment fee for unused capacity           0.075%
Maximum            
Line of Credit Facility [Line Items]            
Debt instrument, basis spread on variable rate           1.125%
Commitment fee for unused capacity           0.20%
February 2016 Term Loan [Member]            
Line of Credit Facility [Line Items]            
Term loan, Maximum Month End Outstanding Amount $ 170,000,000 180,000,000 185,000,000     $ 170,000,000
Term Loan, Maximum Borrowing Capacity         $ 200,000,000  
Debt Instrument, Maturity Date Feb. 19, 2022          
Due in years one and two February 2016 Term Loan [Member]            
Line of Credit Facility [Line Items]            
Debt Instrument, Amount of Periodic Payment           10000000
Due in years three through Maturity February 2016 Term Loan [Member]            
Line of Credit Facility [Line Items]            
Debt Instrument, Amount of Periodic Payment           20000000
June 2017 Term Loan [Member]            
Line of Credit Facility [Line Items]            
Term loan, Maximum Month End Outstanding Amount $ 95,000,000 97,500,000 100,000,000     $ 95,000,000
Term Loan, Maximum Borrowing Capacity       $ 100,000,000    
Debt Instrument, Maturity Date Jun. 15, 2022          
Due in years one and two June 2017 Term Loan [Member]            
Line of Credit Facility [Line Items]            
Debt Instrument, Amount of Periodic Payment           5000000
Due in years three through five June 2017 Term Loan [Member] [Member]            
Line of Credit Facility [Line Items]            
Debt Instrument, Amount of Periodic Payment           10000000
2016 Senior Credit Facility [Member]            
Line of Credit Facility [Line Items]            
Line of Credit Facility, Maximum Month-end Outstanding Amount $ 128,000,000 $ 0 $ 170,000,000      
Number of Financial Covenants [Member]            
Line of Credit Facility [Line Items]            
Debt Instrument, Covenant Description           2
Fixed Charge Coverage Ratio Minimum Requirement [Member]            
Line of Credit Facility [Line Items]            
Debt Instrument, Covenant Description           2.00
Leverage Ratio Maximum Requirement [Member]            
Line of Credit Facility [Line Items]            
Debt Instrument, Covenant Description           4.00