Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2020	Jul. 31, 2019
Cash flows from operating activities:
Net income	$ 120,592	$ 85,815
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	65,820	59,808
Share-based compensation	7,021	7,542
Loss on disposal of assets and impairment charges	340	527
Deferred income taxes	9,767	17,052
Changes in assets and liabilities:
Receivables	(7,147)	(1,698)
Inventories	(2,788)	(474)
Prepaid expenses	(7,332)	(5,476)
Accounts payable	117,756	3,610
Accrued expenses	21,631	(3,699)
Income taxes	27,087	15,054
Other, net	(697)	696
Net cash provided by operating activities	352,050	178,757
Cash flows from investing activities:
Purchase of property and equipment	(45,146)	(101,398)
Payments for acquisition of businesses, net of cash acquired	0	(4,868)
Proceeds from sales of property and equipment	1,695	1,699
Net cash used in investing activities	(43,451)	(104,567)
Cash flows from financing activities:
Repayments of long-term debt	(873)	(905)
Net payments of short-term debt	(120,000)	(25,000)
Proceeds from exercise of stock options	211	2,261
Payments of cash dividends	(11,779)	(10,633)
Tax withholdings on employee share-based awards	(7,917)	(6,476)
Net cash used in financing activities	(140,358)	(40,753)
Net increase in cash and cash equivalents	168,241	33,437
Cash and cash equivalents at beginning of the period	78,275	63,296
Cash and cash equivalents at end of the period	246,516	96,733
Cash paid (received) during the period for:
Interest, net of amount capitalized	6,882	6,837
Income taxes, net	45	(6,401)
Noncash investing and financing activities:
Purchased property and equipment in accounts payable	12,890	23,947
Noncash additions from adoption of ASC 842	$ 0	$ 22,635