Loans Payable and Long-Term Debt (Narrative) (Details) - USD ($)			12 Months Ended
	Mar. 08, 2025	Oct. 10, 2024	Apr. 30, 2025	Apr. 30, 2024	Apr. 30, 2023	Mar. 08, 2022	Apr. 22, 2021
Debt Instrument [Line Items]
Debt, outstanding balance			$ 376,987,000	$ 376,114,000
Debt issuance costs			3,503,000	1,631,000
Outstanding amounts under finance lease obligations			6,080,000
Amortization of intangible assets				30,400,000	$ 45,700,000
Net gain on debt modification			10,000	0	$ 2,089,000
Debt
Debt Instrument [Line Items]
Outstanding amounts under finance lease obligations			6,100,000	5,600,000
Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Loan agreement amount						$ 400,000
Debt Instrument, Decrease, Forgiveness	$ 400,000
Initial Term Loan [Member] | Loans Payable [Member]
Debt Instrument [Line Items]
Loan agreement amount							$ 250,000,000
Term Loans [Member]
Debt Instrument [Line Items]
Debt, outstanding balance			197,500,000	206,250,000
Term Loans [Member] | Loans Payable [Member]
Debt Instrument [Line Items]
Loan agreement amount		$ 200,000,000
Proceeds from Issuance of Debt		200,000,000
Long-term Debt, Gross			$ 197,500,000	206,300,000
Minimum [Member]
Debt Instrument [Line Items]
Interest rates on finance leases (percent)			2.90%
Maximum [Member]
Debt Instrument [Line Items]
Interest rates on finance leases (percent)			6.90%
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Amount outstanding			$ 173,400,000	163,800,000
Proceeds from term loan		173,000,000
Line of credit facility, maximum borrowing capacity		500,000,000					500,000,000
Line of Credit Facility, Remaining Borrowing Capacity			$ 314,200,000	322,900,000
Line of Credit Facility, Commitment Fee Percentage			0.20%
Consolidated Interest Coverage Ratio			2.00
Total Net Leverage Ratio			4.00
Revolving Credit Facility [Member] | 4.875% Senior Notes Due 2026 [Member]
Debt Instrument [Line Items]
Debt redemption		370,000,000
Line of Credit
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity		$ 50,000,000					$ 50,000,000
Letter of Credit [Member]
Debt Instrument [Line Items]
Amount outstanding			$ 12,400,000	$ 13,300,000
Base Rate | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Spread on interest rate			0.25%
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Spread on interest rate			1.25%