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Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Oct. 31, 2012
Oct. 31, 2011
Cash flows from operating activities:    
Net income/(loss) $ 38,971 $ (802)
Adjustments to reconcile net income/(loss) to net cash provided by/(used in) operating activities:    
Amortization and depreciation 8,074 7,881
Loss on sale of discontinued operations, including $45 of stock-based compensation expense (Note 12) 798  
Loss on sale/disposition of assets 292 320
Provisions for/(recoveries of) losses on accounts receivable 380 (636)
Change in disposal group assets and liabilities (1,232) 5,005
Stock-based compensation expense 1,906 1,124
Excess book deduction of stock-based compensation   (240)
Changes in operating assets and liabilities:    
Accounts receivable (6,541) 7,828
Inventories (10,039) (8,346)
Other current assets (1,213) (1,460)
Income tax receivable/payable (9,062) (1,417)
Accounts payable (3,964) (7,803)
Accrued payroll (591) 1,297
Accrued taxes other than income 497 (8,181)
Accrued profit sharing (3,286) 1,974
Accrued other expenses (1,175) (1,349)
Accrued product/municipal liability (32) (309)
Accrued warranty (302) 2,351
Other assets (39) (79)
Other non-current liabilities 329 306
Net cash provided by/(used in) operating activities 13,771 (2,536)
Cash flows from investing activities:    
Proceeds from sale of discontinued operations (Note 3) 7,500  
Receipts from note receivable 36  
Payments to acquire patents and software (22) (64)
Proceeds from sale of property and equipment 13  
Payments to acquire property and equipment (15,836) (6,086)
Net cash used in investing activities (8,309) (6,150)
Cash flows from financing activities:    
Proceeds from loans and notes payable 1,753 1,532
Cash paid for debt issue costs   (1,887)
Proceeds from energy efficiency incentive programs   225
Payments on capital lease obligation (300)  
Payments on loans and notes payable (7,405) (990)
Proceeds from exercise of options to acquire common stock, including employee stock purchase plan 4,084 704
Excess tax benefit of stock-based compensation 984  
Net cash used in financing activities (884) (416)
Net increase/(decrease) in cash and cash equivalents 4,578 (9,102)
Cash and cash equivalents, beginning of period 56,717 58,292
Cash and cash equivalents, end of period 61,295 49,190
Cash paid for:    
Interest 3,013 2,649
Income taxes $ 22,204 $ 1,129