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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Jul. 31, 2018
Jul. 31, 2017
Apr. 30, 2018
Cash flows from operating activities:      
Net income $ 7,645 $ (2,165)  
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 12,852 13,769  
Loss on sale/disposition of assets 7 5  
Provision for losses on notes and accounts receivable 55 227  
Deferred income taxes (1,520)    
Change in fair value of contingent consideration   (1,300)  
Stock-based compensation expense 1,990 1,888  
Changes in operating assets and liabilities:      
Accounts receivable 15,208 15,470  
Inventories (13,538) (29,385)  
Prepaid expenses and other current assets (2,363) (2,233)  
Income taxes 3,892 (2,107)  
Accounts payable (3,921) (12,752)  
Accrued payroll and incentives (653) (12,051)  
Accrued profit sharing 254 1,611  
Accrued expenses (8,568) (5,520)  
Accrued warranty (656) (42)  
Other assets (62) (217)  
Other non-current liabilities 17 310  
Net cash provided by/(used in) operating activities 10,639 (34,492)  
Cash flows from investing activities:      
Payments to acquire patents and software (190) (97)  
Proceeds from sale of property and equipment 1    
Payments to acquire property and equipment (6,919) (4,691)  
Net cash used in investing activities (7,108) (4,788)  
Cash flows from financing activities:      
Proceeds from loans and notes payable   25,000  
Payments on capital lease obligation (161) (161)  
Payments on notes and loans payable (26,575) (1,575)  
Proceeds from exercise of options to acquire common stock 139    
Payment of employee withholding tax related to restricted stock units (556) (2,161)  
Net cash (used in)/provided by financing activities (27,153) 21,103  
Net decrease in cash and cash equivalents (23,622) (18,177)  
Cash and cash equivalents, beginning of period 48,860 61,549 $ 61,549
Cash and cash equivalents, end of period 25,238 43,372 $ 48,860
Supplemental disclosure of cash flow information Cash paid for:      
Interest 1,220 3,199  
Income taxes 484 417  
Supplemental Disclosure of Non-cash Investing and Financing Activities:      
Purchases of property and equipment included in accounts payable 4,332 $ 1,815  
Purchases of property and equipment funded by capital lease 12,074    
Capital lease obligation $ 12,074