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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Oct. 31, 2015
Oct. 31, 2014
Cash flows from operating activities:    
Net income $ 140,839 $ 99,966
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 81,206 73,524
Other amortization 210 198
Stock based compensation 3,373 2,667
(Gain) loss on disposal of assets and impairment charges (191) 132
Deferred income taxes (3,191) 4,451
Excess tax benefits related to stock option exercises (1,417) (1,146)
Changes in assets and liabilities:    
Receivables (9,316) (5,193)
Inventories (6,946) 7,594
Prepaid expenses (838) (1,196)
Accounts payable 2,401 (25,357)
Accrued expenses 5,075 3,872
Income taxes 33,930 23,974
Other, net (176) (94)
Net cash provided by operating activities 244,959 183,392
Cash flows from investing activities:    
Purchase of property and equipment (209,948) (195,682)
Payments for acquisition of businesses, net of cash acquired 0 (34,288)
Proceeds from sales of property and equipment 2,541 1,783
Net cash used in investing activities (207,407) (228,187)
Cash flows from financing activities:    
Repayments of long-term debt (7,697) (361)
Proceeds from exercise of stock options 2,089 8,571
Payments of cash dividends (16,322) (14,652)
Excess tax benefits related to stock option exercises 1,417 1,146
Net cash used in financing activities (20,513) (5,296)
Net increase (decrease) in cash and cash equivalents 17,039 (50,091)
Cash and cash equivalents at beginning of the period 48,541 121,641
Cash and cash equivalents at end of the period 65,580  
Cash paid during the period for:    
Interest, net of amount capitalized 20,206 20,954
Income taxes, net 49,731 30,251
Noncash investing and financing activities:    
Purchased property and equipment in accounts payable $ 17,077 $ 0