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Loans Payable and Long-Term Debt (Narrative) (Details) - USD ($) |  |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 26, 2021 | Apr. 22, 2021 | Dec. 29, 2017 | Jan. 25, 2016 | Apr. 30, 2022 | Apr. 30, 2021 | Mar. 08, 2022 | Feb. 12, 2018
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt, outstanding balance |  |  |  |  | $ 512,552,000 | $ 526,153,000 |  |
New Markets Tax Credit Investment |  |  |  | $ 2,300,000 |  |  |  |
New Markets Tax Credit, Recapture Period |  |  |  | 7 years |  |  |  |
Debt issuance costs |  |  |  |  | 3,556,000 | 4,381,000 |  |
Debt Instrument, Repurchase Date | Apr. 26, 2021 |  |  |  |  |  |  |
Amortization of intangible assets |  |  |  |  | 45,700,000 | 47,900,000 |  |
Senior Notes [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage | 102.438% |  |  |  |  |  |  |
Notes Payable to Banks [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
LIBOR rate |  |  |  | 1.20% |  |  |  |
Loan agreement amount |  |  |  | $ 6,600,000 |  |  | $ 400,000 |
Loan term |  |  |  | 30 years |  |  |  |
Debt issuance costs |  |  |  | $ 300,000 |  |  |  |
Deferred Finance Costs, Amortization Period |  |  |  | 30 years |  |  |  |
Other Noncurrent Assets [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, after Allowance for Credit Loss, Noncurrent |  |  |  | $ 4,300,000 |  |  |  |
Long-term Debt [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Amount drawn on loan |  |  |  |  | 6,700,000 |  |  |
Liability | Debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Outstanding amounts under finance lease obligations |  |  |  |  | 5,000,000 | 5,500,000 |  |
Initial Term Loan [Member] | Loans Payable [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Loan agreement amount |  |  | $ 250,000,000 |  |  |  |  |
Proceeds from Issuance of Debt |  |  | 250,000,000 |  |  |  |  |
Initial Term Loan And Delayed Draw Loan [Member] | Loans Payable [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  |  | 250,000,000 |  |
Delayed Draw Term Loan [Member] | Loans Payable [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Loan agreement amount |  |  | 250,000,000 |  |  |  |  |
4.875% Senior Notes Due 2026 [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Loan agreement amount |  |  |  |  |  |  |  | $ 350,000,000
Debt instrument, interest rate, stated percentage |  |  |  |  |  |  |  | 4.875%
Term Loans [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt, outstanding balance |  |  |  |  | $ 237,500,000 | 250,000,000 |  |
Term Loans [Member] | Loans Payable [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Loan agreement amount |  | $ 250,000,000 |  |  |  |  |  |
Proceeds from Issuance of Debt |  | 250,000,000 |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  |  | 237,500,000 |  |
Minimum [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rates on finance leases (percent) |  |  |  |  | 2.00% |  |  |
Maximum [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rates on finance leases (percent) |  |  |  |  | 4.60% |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Amount outstanding |  |  |  |  | $ 263,000,000 | 264,000,000 |  |
Proceeds from term loan |  | 264,000,000 | 50,000,000 |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  | 500,000,000 | 100,000,000 |  |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  |  |  |  | $ 225,300,000 | 227,700,000 |  |
Line of Credit Facility, Commitment Fee Percentage |  |  |  |  | 0.20% |  |  |
Consolidated Interest Coverage Ratio |  |  |  |  | 2.00 |  |  |
Total Net Leverage Ratio |  |  |  |  | 4.00 |  |  |
Line of Credit |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  | $ 50,000,000 | $ 25,000,000 |  |  |  |  |
Letter of Credit [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Amount outstanding |  |  |  |  | $ 11,700,000 | $ 8,300,000 |  |
London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Spread on interest rate |  |  |  |  | 2.00% |  |  |
Base Rate | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Spread on interest rate |  |  |  |  | 1.00% |  |  |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=123466204&loc=SL6031897-161870 Reference 2: 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=120400017&loc=d3e572229-122910 Reference 3: 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=120391452&loc=d3e13212-122682 Reference 4: 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=120398452&loc=d3e534808-122878 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 2: 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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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=120391452&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=120398452&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=120400017&loc=d3e572229-122910 + Details
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