Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2024	Jul. 31, 2023
Cash flows from operating activities:
Net income	$ 180,198	$ 169,237
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	94,409	82,905
Amortization of debt issuance costs	278	278
Change in excess replacement cost over LIFO inventory valuation	2,431	4,500
Share-based compensation	11,036	10,468
Loss (gain) on disposal of assets and impairment charges	2,475	(1,448)
Deferred income taxes	7,114	15,895
Changes in assets and liabilities:
Receivables	(13,133)	(13,179)
Inventories	(25,378)	(52,756)
Prepaid and other current assets	(7,280)	(2,518)
Accounts payable	17,431	(4,344)
Accrued expenses	(38,750)	(20,150)
Income taxes	49,994	39,139
Other, net	529	1,104
Net cash provided by operating activities	281,354	229,131
Cash flows from investing activities:
Purchase of property and equipment	(100,564)	(68,903)
Payments for acquisition of businesses, net of cash acquired	(18,113)	(13,297)
Proceeds from sales of assets	6,688	5,784
Net cash used in investing activities	(111,989)	(76,416)
Cash flows from financing activities:
Payments of long-term debt and finance lease obligations	(29,316)	(29,665)
Payments of cash dividends	(16,611)	(14,945)
Repurchase of common stock	0	(29,893)
Tax withholdings on employee share-based awards	(24,932)	(17,969)
Net cash used in financing activities	(70,859)	(92,472)
Net increase in cash and cash equivalents	98,506	60,243
Cash and cash equivalents at beginning of the period	206,482	378,869
Cash and cash equivalents at end of the period	304,988	439,112
Cash paid during the period for:
Interest, net of amount capitalized	11,845	10,701
Income taxes, net	0	0
Noncash investing and financing activities:
Purchased property and equipment in accounts payable	55,768	42,188
Right-of-use assets obtained in exchange for new finance lease liabilities	221	8,345
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 0	$ 2,214