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Long-term Debt and Finance Lease Obligations, Lines of Credit and Fair Value Disclosure - Narrative (Details) - USD ($)	3 Months Ended
	Jul. 31, 2024	Jul. 31, 2023	Apr. 30, 2024
Debt Instrument
Fair value of long-term debt	$ 1,387,000,000		$ 1,375,000,000
Finance lease obligations	99,847,000		101,818,000
Interest income	2,385,000	$ 3,576,000
Capitalized interest	419,000	$ 794,000
Unsecured Revolving Credit Facility Due January 2024 | Revolving Credit Facility
Debt Instrument
Maximum borrowing capacity	850,000,000
Fair value of amount outstanding	$ 0		0
Unsecured Revolving Credit Facility Due January 2024 | Revolving Credit Facility | Secured Overnight Financing Rate
Debt Instrument
Effective percentage	0.10%
Unsecured Revolving Credit Facility Due January 2024 | Revolving Credit Facility | Federal Funds
Debt Instrument
Effective percentage	0.50%
Unsecured Revolving Credit Facility Due January 2024 | Revolving Credit Facility | Daily Simple Secured Overnight Financing Rate
Debt Instrument
Effective percentage	1.00%
Unsecured Revolving Credit Facility Due January 2024 | Minimum | Revolving Credit Facility
Debt Instrument
Facility fee percentage	0.15%
Unsecured Revolving Credit Facility Due January 2024 | Minimum | Revolving Credit Facility | Secured Overnight Financing Rate
Debt Instrument
Effective percentage	0.00%
Basis spread on variable rate	1.10%
Unsecured Revolving Credit Facility Due January 2024 | Minimum | Revolving Credit Facility | Daily Simple Secured Overnight Financing Rate
Debt Instrument
Effective percentage	1.00%
Basis spread on variable rate	0.10%
Unsecured Revolving Credit Facility Due January 2024 | Maximum | Revolving Credit Facility
Debt Instrument
Facility fee percentage	0.30%
Unsecured Revolving Credit Facility Due January 2024 | Maximum | Revolving Credit Facility | Secured Overnight Financing Rate
Debt Instrument
Basis spread on variable rate	1.70%
Unsecured Revolving Credit Facility Due January 2024 | Maximum | Revolving Credit Facility | Daily Simple Secured Overnight Financing Rate
Debt Instrument
Basis spread on variable rate	0.70%
Unsecured Revolving Line of Credit | Line of Credit
Debt Instrument
Maximum borrowing capacity	$ 50,000,000
Fair value of amount outstanding	0		$ 0
Unsecured Revolving Line of Credit | Letter of Credit
Debt Instrument
Maximum borrowing capacity	$ 308,000

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Present value of lessee's discounted obligation for lease payments from finance lease.

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