Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2021	Jul. 31, 2020
Cash flows from operating activities:
Net income	$ 119,159	$ 120,592
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	75,888	65,820
Amortization of debt issuance costs	359	0
Share-based compensation	8,623	7,021
(Gain) loss on disposal of assets and impairment charges	(1,770)	340
Deferred income taxes	33,460	9,767
Changes in assets and liabilities:
Receivables	(18,511)	(7,147)
Inventories	(26,624)	(2,788)
Prepaid expenses	(5,264)	(7,332)
Accounts payable	65,727	117,756
Accrued expenses	(12,035)	21,631
Income taxes	1,531	27,087
Other, net	1,016	(697)
Net cash provided by operating activities	241,559	352,050
Cash flows from investing activities:
Purchase of property and equipment	(45,045)	(45,146)
Payments for acquisition of businesses, net of cash acquired	(617,291)	0
Proceeds from sales of property and equipment	18,001	1,695
Net cash used in investing activities	(644,335)	(43,451)
Cash flows from financing activities:
Proceeds from long-term debt	300,000	0
Payments of long-term debt	(4,867)	(873)
Payments of debt issuance costs	(249)	0
Net payments of short-term debt	0	(120,000)
Proceeds from exercise of stock options	133	211
Payments of cash dividends	(12,609)	(11,779)
Tax withholdings on employee share-based awards	(17,249)	(7,917)
Net cash provided by (used in) financing activities	265,159	(140,358)
Net (decrease) increase in cash and cash equivalents	(137,617)	168,241
Cash and cash equivalents at beginning of the period	336,545	78,275
Cash and cash equivalents at end of the period	198,928	246,516
Cash paid during the period for:
Interest, net of amount capitalized	7,914	6,882
Income taxes, net	0	45
Noncash investing and financing activities:
Purchased property and equipment in accounts payable	22,007	12,890
Right-of-use assets obtained in exchange for new finance lease liabilities	47,775	0
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 39,021	$ 0