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Debt - (Additional Information) (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Aug. 04, 2017 | Sep. 30, 2018 | Oct. 01, 2017 | Sep. 30, 2018 | Oct. 01, 2017 | Mar. 31, 2018 | Aug. 03, 2017 | Apr. 23, 2015
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Increase in borrowing capacity limit | $ 325,000,000 |  |  |  |  |  |  |
Company owned capital stock, percentage securing senior secured credit facility | 65.00% |  |  |  |  |  |  |
Short-term debt |  | $ 14,071,000 |  | $ 14,071,000 |  | $ 18,341,000 |  |
Short-term debt, weighted average interest rate |  | 4.00% |  | 4.00% |  | 7.00% |  |
Amortization expense relating to debt issuance costs and included in interest expense |  | $ 314,000 | $ 327,000 | $ 627,000 | $ 674,000 |  |  |
Deferred issuance costs, net of accumulated amortization |  | 5,338,000 |  | 5,338,000 |  | $ 5,965,000 |  |
5.00% Senior Notes, due 2023 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  | 5.00%
Long-term debt |  | 300,000,000 |  | 300,000,000 |  | 300,000,000 |  | $ 300,000,000
Standby Letters of Credit |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Available lines of credit |  | 531,132,000 |  | 531,132,000 |  | 613,234,000 |  |
Stand by letters of credit |  | 3,422,000 |  | 3,422,000 |  | 3,074,000 |  |
Outstanding amount |  | 87,857,000 |  | 87,857,000 |  | $ 150,459,000 |  |
2017 Credit Facility, due 2022 | Revolving Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity | $ 600,000,000 |  |  |  |  |  |  |
Available lines of credit |  | 155,000,000 |  | 155,000,000 |  |  |  |
2017 Credit Facility, due 2022 | Secured Debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, face amount | 150,000,000 |  |  |  |  |  |  |
Available lines of credit |  | 150,000,000 |  | 150,000,000 |  |  |  |
Current portion of long-term debt |  | $ 7,500,000 |  | $ 7,500,000 |  |  |  |
2011 Credit Facility, due 2018 | Revolving Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  | $ 500,000 |
Available lines of credit | 240,000,000 |  |  |  |  |  |  |
2011 Credit Facility, due 2018 | Secured Debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  | $ 150,000 |
Available lines of credit | $ 123,750,000 |  |  |  |  |  |  |
LIBOR | 2017 Revolver And 2017 Term Loan |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate | 1.25% |  |  |  |  |  |  |
LIBOR | 2017 Revolver And 2017 Term Loan | Minimum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate | 1.25% |  |  |  |  |  |  |
LIBOR | 2017 Revolver And 2017 Term Loan | Maximum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate | 2.00% |  |  |  |  |  |  |
Federal Funds Effective Rate | 2017 Revolver And 2017 Term Loan |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate | 0.50% |  |  |  |  |  |  |
Eurocurrency Base Rate | 2017 Revolver And 2017 Term Loan |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate | 1.00% |  |  |  |  |  |  |
Debt Instrument Quarterly Installments Beginning December 31, 2018 Through December 30, 2019 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, periodic payment | $ 1,875,000 |  |  |  |  |  |  |
Debt Instrument Quarterly Installments Beginning December 31, 2019 Through December 30, 2020 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, periodic payment | 2,813,000 |  |  |  |  |  |  |
Debt Instrument Quarterly Installments Beginning December 31, 2020 Through September 29, 2022 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, periodic payment | 3,750,000 |  |  |  |  |  |  |
Debt Instrument Final Installments Payable On September 30, 2022 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, periodic payment | $ 105,000,000 |  |  |  |  |  |  |

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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