Loans Payable and Long-Term Debt (Narrative) (Details) - USD ($)				1 Months Ended	12 Months Ended
	Apr. 22, 2021	Dec. 29, 2017	Jan. 25, 2016	Feb. 28, 2023	Apr. 30, 2023	Apr. 30, 2022	Apr. 30, 2021	Mar. 08, 2022
Debt Instrument [Line Items]
Debt, outstanding balance					$ 374,132,000	$ 512,552,000
New Markets Tax Credit Investment			$ 2,300,000
New Markets Tax Credit, Recapture Period			7 years
Debt issuance costs				$ 200,000	2,473,000	3,556,000
Outstanding amounts under finance lease obligations					3,702,000
Amortization of intangible assets					45,700,000	45,700,000
Reduction in other long-term debt				6,600,000
Reduction in loans receivable				$ 4,300,000
Net gain on debt modification					2,089,000	0	$ 0
Debt
Debt Instrument [Line Items]
Outstanding amounts under finance lease obligations					3,700,000	5,000,000
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
Other Noncurrent Assets [Member]
Debt Instrument [Line Items]
Financing Receivable, after Allowance for Credit Loss, Noncurrent			$ 4,300,000
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						237,500,000
Delayed Draw 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					$ 206,250,000	237,500,000
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						206,300,000
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)					6.10%
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Amount outstanding					$ 163,800,000	263,000,000
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					$ 323,200,000	225,300,000
Line of Credit Facility, Commitment Fee Percentage					0.13%
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 instrument, interest rate, stated percentage	4.875%
Debt redemption	$ 350,000,000
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					$ 13,000,000	$ 11,700,000
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
Debt Instrument [Line Items]
Spread on interest rate					0.10%
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Spread on interest rate					1.25%