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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Oct. 31, 2017
Oct. 31, 2016
Cash flows from operating activities:    
Net income $ 105,676 $ 124,572
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 106,526 94,530
Stock-based compensation 13,700 4,948
Loss on disposal of assets and impairment charges 1,091 294
Deferred income taxes 21,543 19,839
Changes in assets and liabilities:    
Receivables 746 (5,229)
Inventories (39,035) (2,854)
Prepaid expenses 2,412 (1,952)
Accounts payable 69 (3,239)
Accrued expenses 8,907 (1,221)
Income taxes 20,604 13,238
Other, net (676) (2,842)
Net cash provided by operating activities 241,563 240,084
Cash flows from investing activities:    
Purchase of property and equipment (248,797) (203,602)
Payments for acquisition of businesses, net of cash acquired (22,781) (5,596)
Proceeds from sales of property and equipment 2,297 1,726
Net cash used in investing activities (269,281) (207,472)
Cash flows from financing activities:    
Proceeds from long-term debt 400,000 100,000
Repayments of long-term debt (7,708) (7,697)
Net repayments of short-term debt (900) 0
Proceeds from exercise of stock options 298 1,719
Payments of cash dividends (19,235) (17,988)
Repurchase of common stock (132,613) 0
Tax withholdings on employee share-based awards (3,656) (6,448)
Net cash provided by financing activities 236,186 69,586
Net increase in cash and cash equivalents 208,468 102,198
Cash and cash equivalents at beginning of the period 76,717 75,775
Cash and cash equivalents at end of the period 285,185 177,973
Cash paid during the period for:    
Interest, net of amount capitalized 21,428 20,065
Income taxes, net 21,414 33,038
Noncash investing and financing activities:    
Purchased property and equipment in accounts payable 12,563 12,980
Shares repurchased in accounts payable $ 575 $ 0