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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Jul. 31, 2018
Jul. 31, 2017
Cash flows from operating activities:    
Net income $ 70,224 $ 56,758
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 58,840 52,369
Stock-based compensation 10,272 9,807
Loss on disposal of assets and impairment charges 345 140
Deferred income taxes 9,205 15,564
Changes in assets and liabilities:    
Receivables (1,441) (1,300)
Inventories (22,211) (24,244)
Prepaid expenses (3,174) 928
Accounts payable 9,588 (20,010)
Accrued expenses 12,281 8,284
Income taxes 8,901 18,899
Other, net (2,759) (56)
Net cash provided by operating activities 150,071 117,139
Cash flows from investing activities:    
Purchase of property and equipment (97,490) (91,548)
Payments for acquisition of businesses, net of cash acquired (841) (3,322)
Proceeds from sales of property and equipment 1,879 1,607
Net cash used in investing activities (96,452) (93,263)
Cash flows from financing activities:    
Proceeds from long-term debt 0 150,000
Repayments of long-term debt (92) (103)
Net repayments of short-term debt (12,189) (900)
Proceeds from exercise of stock options 148 195
Payments of cash dividends (9,592) (9,312)
Repurchase of common stock (37,479) (77,878)
Tax withholdings on employee share-based awards (3,252) (3,494)
Net cash (used in) provided by financing activities (62,456) 58,508
Net (decrease) increase in cash and cash equivalents (8,837) 82,384
Cash and cash equivalents at beginning of the period 53,679 76,717
Cash and cash equivalents at end of the period 44,842 159,101
Cash paid during the period for:    
Interest, net of amount capitalized 5,205 4,673
Income taxes, net 397 463
Noncash investing and financing activities:    
Purchased property and equipment in accounts payable 4,524 7,752
Shares repurchased in accounts payable $ 0 $ 1,486