Senior Credit Facility - Credit Agreement (Details) - USD ($) | Feb. 19, 2021 | Mar. 31, 2016 | Mar. 26, 2016 | Dec. 26, 2015 | Mar. 28, 2015 | Mar. 26, 2016 | Mar. 26, 2016 | Feb. 19, 2016 |
Line of Credit Facility [Line Items] | | | | | | | | |
Senior credit facility, maximum borrowing capacity | | | $ 500,000,000 | | | $ 500,000,000 | $ 500,000,000 | |
Swingline Loan, Maximum Borrowing Capacity | | | 50,000,000 | | | | | |
Debt Issuance Costs, Gross | | | 1,400,000 | | | 1,400,000 | 1,400,000 | |
Term Loan, Maximum Borrowing Capacity | | | $ 200,000,000 | | | 200,000,000 | | |
Debt Instrument, Maturity Date | | | Feb. 19, 2021 | | | | | |
Purchase Obligation, Due in Next Twelve Months | | | $ 0 | | | 0 | 0 | |
Letters of Credit Outstanding, Amount | | | $ 47,600,000 | $ 48,700,000 | $ 50,500,000 | $ 47,600,000 | $ 47,600,000 | |
Debt instrument, basis spread on variable rate | | | 0.63% | | | | | |
Commitment fee for unused capacity | | | 0.10% | | | | | |
Base Rate | | | | | | | | |
Line of Credit Facility [Line Items] | | | | | | | | |
Line of Credit Facility, Interest Rate Description | | | 0.0350 | | | | bank’s base rate 3.25% | |
London Interbank Offered Rate (LIBOR) | | | | | | | | |
Line of Credit Facility [Line Items] | | | | | | | | |
Line of Credit Facility, Interest Rate Description | | | .00435 | | | | LIBOR plus 0.19% | |
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% | | |
Senior credit facility [Member] | | | | | | | | |
Line of Credit Facility [Line Items] | | | | | | | | |
Senior credit facility, maximum borrowing capacity | | | | | | | | $ 400,000,000 |
Swingline loan [Member] | | | | | | | | |
Line of Credit Facility [Line Items] | | | | | | | | |
Swing loan maximum borrowing capacity | | | | | | | | $ 30,000,000 |
2016 Senior Credit Facility [Member] | | | | | | | | |
Line of Credit Facility [Line Items] | | | | | | | | |
Term loan, Maximum Month End Outstanding Amount | | | $ 200,000,000 | | | $ 200,000,000 | $ 200,000,000 | |
Number of Financial Covenants [Member] | | | | | | | | |
Line of Credit Facility [Line Items] | | | | | | | | |
Debt Instrument, Covenant Description | | | | | | 2 | | |
2011 Senior Credit Facility [Member] | | | | | | | | |
Line of Credit Facility [Line Items] | | | | | | | | |
Line of Credit Facility, Maximum Month-end Outstanding Amount | | | | $ 150,000,000 | $ 60,000,000 | | | |
2016 Senior Credit Facility [Member] | | | | | | | | |
Line of Credit Facility [Line Items] | | | | | | | | |
Line of Credit Facility, Maximum Month-end Outstanding Amount | | | 50,000,000 | | | | | |
Unsecured Debt | | | 250,000,000 | | | $ 250,000,000 | 250,000,000 | |
Compensating Balance, Amount | | | $ 0 | | | $ 0 | $ 0 | |
Debt Instrument, Covenant Compliance | | | all | | | | | |
Due in years one and two [Member] | | | | | | | | |
Line of Credit Facility [Line Items] | | | | | | | | |
Debt Instrument, Frequency of Periodic Payment | | | | | | 10 | | |
Due in years three through five [Member] | | | | | | | | |
Line of Credit Facility [Line Items] | | | | | | | | |
Debt Instrument, Frequency of Periodic Payment | | | | | | 20 | | |
Fixed Charge Coverage Ratio Minimum Requirement [Member] | | | | | | | | |
Line of Credit Facility [Line Items] | | | | | | | | |
Debt Instrument, Covenant Description | | | 2 | | | | | |
Leverage Ratio Maximum Requirement [Member] | | | | | | | | |
Line of Credit Facility [Line Items] | | | | | | | | |
Debt Instrument, Covenant Description | | | 4 | | | | | |
Interest Rate Swap [Member] | | | | | | | | |
Line of Credit Facility [Line Items] | | | | | | | | |
Debt Instrument, Maturity Date Range, Start | | Mar. 31, 2016 | | | | | | |
Debt Instrument, Maturity Date Range, End | Feb. 19, 2021 | | | | | | | |
Derivative, Notional Amount | | $ 197,500,000 | | | | | | |