Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2023	Apr. 30, 2022	Apr. 30, 2021
Cash flows from operating activities
Net income	$ 446,691	$ 339,790	$ 312,900
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	313,131	303,541	265,195
Amortization of debt issuance costs	1,789	2,527	1,603
Stock-based compensation	47,024	37,976	31,986
Loss (gain) on disposal of assets and impairment charges	6,871	(1,201)	9,680
Deferred income taxes	23,126	82,721	4,123
Changes in assets and liabilities:
Receivables	(12,519)	(33,025)	(26,278)
Inventories	24,090	(76,730)	(50,342)
Prepaid expenses	(4,248)	(6,376)	(1,413)
Accounts payable	(9,483)	165,893	166,546
Accrued expenses	20,292	23,574	65,497
Income taxes	20,652	(35,716)	5,714
Other, net	4,535	(14,233)	18,877
Net cash provided by operating activities	881,951	788,741	804,088
Cash flows from investing activities
Purchase of property and equipment	(476,568)	(326,475)	(441,252)
Payments for acquisitions of businesses, net of cash acquired	(85,569)	(901,638)	(9,356)
Proceeds from sales of property and equipment	17,103	70,118	6,268
Net cash used in investing activities	(545,034)	(1,157,995)	(444,340)
Cash flows from financing activities
Proceeds from long-term debt	0	450,000	650,000
Repayments of long-term debt	(40,970)	(188,537)	(571,661)
Repayments of short-term debt	0	0	(120,000)
Payment of debt issuance costs	(3,940)	(1,149)	(5,525)
Proceeds from exercise of stock options	0	133	1,784
Payments of cash dividends	(55,617)	(51,212)	(47,971)
Tax withholdings on employee share-based awards	(16,399)	(17,648)	(8,105)
Net cash (used in) provided by financing activities	(116,926)	191,587	(101,478)
Net increase (decrease) in cash and cash equivalents	219,991	(177,667)	258,270
Cash and cash equivalents at beginning of year	158,878	336,545	78,275
Cash and cash equivalents at end of year	378,869	158,878	336,545
SUPPLEMENTAL DISCLOSURES OF CASH FLOWS INFORMATION
Cash paid for interest, net of amount capitalized	56,799	54,499	48,508
Cash paid for income taxes, net	90,398	49,565	80,916
Noncash investing and financing activities
Purchased property and equipment in accounts payable	$ 27,905	$ 46,659	$ 9,204