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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Jan. 31, 2020
Jan. 31, 2019
Cash flows from operating activities:    
Net income $ 201,755 $ 178,674
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 185,981 181,520
Share-based compensation 14,394 11,111
Loss on disposal of assets and impairment charges 2,115 1,159
Deferred income taxes 39,454 38,925
Changes in assets and liabilities:    
Receivables (8,527) 4,146
Inventories 10,207 (8,252)
Prepaid expenses (6,937) (3,986)
Accounts payable (53,534) (66,946)
Accrued expenses 12,737 22,772
Income taxes 9,204 36,685
Other, net (7,142) (18,052)
Net cash provided by operating activities 399,707 377,756
Cash flows from investing activities:    
Purchase of property and equipment (363,907) (311,165)
Payments for acquisition of businesses, net of cash acquired (12,644) (21,021)
Proceeds from sales of property and equipment 3,813 4,159
Net cash used in investing activities (372,738) (328,027)
Cash flows from financing activities:    
Repayments of long-term debt (9,329) (7,839)
Net borrowings of short-term debt 1,000 10,400
Proceeds from exercise of stock options 2,392 1,168
Payments of cash dividends (34,178) (30,808)
Repurchase of common stock 0 (37,479)
Tax withholdings on employee share-based awards (6,611) (4,681)
Net cash used in financing activities (46,726) (69,239)
Net decrease in cash and cash equivalents (19,757) (19,510)
Cash and cash equivalents at beginning of the period 63,296 53,679
Cash and cash equivalents at end of the period 43,539 34,169
Cash paid (received) during the period for:    
Interest, net of amount capitalized 33,636 33,354
Income taxes, net 10,800 (21,977)
Noncash investing and financing activities:    
Purchased property and equipment in accounts payable 9,813 2,172
Noncash additions from adoption of ASC 842 $ 1,037 $ 22,635