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Consolidated Statements Of Cash Flows (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Oct. 31, 2013
Oct. 31, 2012
Cash flows from operating activities:    
Net income $ 43,463 $ 38,971
Adjustments to reconcile net income to net cash provided by operating activities:    
Amortization and depreciation 11,152 8,074
Loss on sale of discontinued operations, including $45 of stock-based compensation expense   798
Loss on sale/disposition of assets 77 292
Provisions for losses on accounts receivable 33 380
Change in disposal group assets and liabilities   (1,232)
Stock-based compensation expense 4,774 1,906
Changes in operating assets and liabilities:    
Accounts receivable (22,466) (6,541)
Inventories (13,263) (10,039)
Prepaid expenses and other current assets (1,836) (1,213)
Income tax receivable/payable (6,099) (9,062)
Accounts payable 14,602 (3,964)
Accrued payroll (1,587) (591)
Accrued taxes other than income 1,153 497
Accrued profit sharing (4,313) (3,286)
Accrued other expenses (373) (1,175)
Accrued product/municipal liability (57) (32)
Accrued warranty (166) (302)
Other assets (781) (39)
Other non-current liabilities (330) 329
Net cash provided by operating activities 23,983 13,771
Cash flows from investing activities:    
Proceeds from sale of business   7,500
Receipts from note receivable 38 36
Payments to acquire patents and software (81) (22)
Proceeds from sale of property and equipment 15 13
Payments to acquire property and equipment (26,075) (15,836)
Net cash used in investing activities (26,103) (8,309)
Cash flows from financing activities:    
Proceeds from loans and notes payable 101,583 1,753
Cash paid for debt issue costs (3,770)  
Payments on capital lease obligation (349) (300)
Payments on loans and notes payable (44,354) (7,405)
Payments to acquire treasury stock (100,848)  
Proceeds from exercise of options to acquire common stock, including employee stock purchase plan 1,689 4,084
Taxes paid related to restricted stock issuance (791)  
Excess tax benefit of stock-based compensation 1,395 984
Net cash used in financing activities (45,445) (884)
Net increase in cash and cash equivalents (47,565) 4,578
Cash and cash equivalents, beginning of period 100,487 56,717
Cash and cash equivalents, end of period 52,922 61,295
Supplemental disclosure of cash flow information Cash paid for:    
Interest 4,600 3,013
Income taxes $ 29,157 $ 22,204