Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Jan. 31, 2021	Jan. 31, 2020
Cash flows from operating activities:
Net income	$ 271,202	$ 201,755
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	195,299	185,981
Amortization of debt issuance costs	1,258	0
Share-based compensation	22,009	14,394
Loss on disposal of assets and impairment charges	3,808	2,115
Deferred income taxes	13,554	39,454
Changes in assets and liabilities:
Receivables	(18,117)	(8,527)
Inventories	(35,238)	10,207
Prepaid expenses	(7,993)	(6,937)
Accounts payable	124,026	(53,534)
Accrued expenses	56,228	12,737
Income taxes	18,363	9,204
Other, net	18,680	(7,142)
Net cash provided by operating activities	663,079	399,707
Cash flows from investing activities:
Purchase of property and equipment	(263,077)	(363,907)
Payments for acquisition of businesses, net of cash acquired	(5,780)	(12,644)
Proceeds from sales of property and equipment	4,823	3,813
Net cash used in investing activities	(264,034)	(372,738)
Cash flows from financing activities:
Proceeds from long-term debt	650,000	0
Payments of long-term debt	(570,999)	(9,329)
Payments of debt issuance costs	(5,525)	0
Net (payments) borrowings of short-term debt	(120,000)	1,000
Proceeds from exercise of stock options	1,665	2,392
Payments of cash dividends	(35,410)	(34,178)
Tax withholdings on employee share-based awards	(8,105)	(6,611)
Net cash used in financing activities	(88,374)	(46,726)
Net increase (decrease) in cash and cash equivalents	310,671	(19,757)
Cash and cash equivalents at beginning of the period	78,275	63,296
Cash and cash equivalents at end of the period	388,946	43,539
Cash paid during the period for:
Interest, net of amount capitalized	32,862	33,636
Income taxes, net	48,137	10,800
Noncash investing and financing activities:
Purchased property and equipment in accounts payable	28,605	9,813
Right-of-use assets obtained in exchange for new finance lease liabilities	0	1,520
Right-of-use assets obtained in exchange for new operating lease liabilities	1,109	1,037
Noncash additions from adoption of ASC 842	$ 0	$ 22,635