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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Oct. 31, 2019
Oct. 31, 2018
Cash flows from operating activities:    
Net (loss)/income $ (815) $ 14,310
Adjustments to reconcile net income to net cash (used in)/provided by operating activities:    
Depreciation and amortization 27,993 25,994
Loss/(gain) on sale/disposition of assets 15 (1,038)
Provision for losses on notes and accounts receivable 392 146
Deferred income taxes   (1,519)
Change in fair value of contingent consideration 100  
Stock-based compensation expense 3,016 3,952
Changes in operating assets and liabilities:    
Accounts receivable (9,114) (7,278)
Inventories (37,443) (22,482)
Prepaid expenses and other current assets (2,376) (1,352)
Income taxes (2,914) 3,786
Accounts payable 1,019 5,488
Accrued payroll and incentives (10,833) 2,322
Accrued profit sharing (1,632) (369)
Accrued expenses and deferred revenue (92) (12,052)
Accrued warranty (1,124) (992)
Other assets 1,372 40
Other non-current liabilities (2,170) 95
Net cash (used in)/provided by operating activities (34,606) 9,051
Cash flows from investing activities:    
Payments to acquire patents and software (389) (207)
Proceeds from sale of property and equipment   1,223
Payments to acquire property and equipment (8,979) (19,605)
Net cash used in investing activities (9,368) (18,589)
Cash flows from financing activities:    
Proceeds from loans and notes payable 75,000 50,000
Payments on finance lease obligation (431) (323)
Payments on notes and loans payable (28,150) (53,150)
Proceeds from exercise of options to acquire common stock, including employee stock purchase plan 936 1,158
Payment of employee withholding tax related to restricted stock units (550) (600)
Net cash provided by/(used in) financing activities 46,805 (2,915)
Net increase/(decrease) in cash and cash equivalents 2,831 (12,453)
Cash and cash equivalents, beginning of period 41,015 48,860
Cash and cash equivalents, end of period 43,846 36,407
Supplemental disclosure of cash flow information Cash paid for:    
Interest 5,767 4,339
Income taxes 4,184 3,065
Supplemental Disclosure of Non-cash Investing and Financing Activities:    
Purchases of property and equipment included in accounts payable 66 4,332
Purchases of property and equipment funded by capital lease   16,547
Capital lease obligation   16,547
Changes in other assets for operating lease obligations 11,821  
Impact of adoption of accounting standard updates   $ (4,610)
Changes in lease liabilities for operating lease obligations 12,790  
ASU 2016-02 | Change in Property and Equipment    
Supplemental Disclosure of Non-cash Investing and Financing Activities:    
Impact of adoption of accounting standard updates 3,201  
ASU 2016-02 | Changes in Finance Lease Liabilities    
Supplemental Disclosure of Non-cash Investing and Financing Activities:    
Impact of adoption of accounting standard updates $ (4,245)