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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Oct. 31, 2020
Oct. 31, 2019
Cash flows from operating activities:    
Income from continuing operations $ 92,417 $ 2,528
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 17,129 16,483
Loss on sale/disposition of assets 3 15
Provision for losses on notes and accounts receivable 29 (219)
Change in fair value of contingent consideration   100
Stock-based compensation expense 2,075 2,826
Changes in operating assets and liabilities:    
Accounts receivable (7,787) (5,585)
Inventories 24,852 (29,260)
Prepaid expenses and other current assets (43) (2,979)
Income taxes (8,267) (2,932)
Accounts payable 28,331 3,486
Accrued payroll and incentives (1,043) (9,510)
Accrued profit sharing 4,613 (1,462)
Accrued expenses and deferred revenue (16,212) (1,134)
Accrued warranty 1,055 (436)
Other assets 2,561 753
Other non-current liabilities (1,625) (1,358)
Cash provided by/(used in) operating activities - continuing operations 138,088 (28,684)
Cash used in operating activities - discontinued operations (2,225) (6,187)
Net cash provided by/(used in) operating activities 135,863 (34,871)
Cash flows from investing activities:    
Payments to acquire patents and software (350) (279)
Payments to acquire property and equipment (14,964) (8,249)
Cash used by investing activities - continuing operations (15,314) (8,528)
Cash used by investing activities - discontinued operations (1,143) (840)
Net cash used in investing activities (16,457) (9,368)
Cash flows from financing activities:    
Proceeds from loans and notes payable 25,000 75,000
Cash paid for debt issuance costs (450)  
Payments on finance lease obligation (479) (431)
Payments on notes and loans payable (185,000) (28,150)
Distribution to discontinued operations (25,000)  
Dividend distribution (2,795)  
Proceeds from exercise of options to acquire common stock, including employee stock purchase plan 2,195 936
Payment of employee withholding tax related to restricted stock units (2,173) (550)
Cash used in/(provided by) financing activities - continuing operations (188,702) 46,805
Cash used in financing activities - discontinued operations (166)  
Net cash used in/(provided by) financing activities (188,868) 46,805
Net (decrease)/increase in cash and cash equivalents (69,462) 2,566
Cash and cash equivalents, beginning of period 125,011 40,853
Cash and cash equivalents, end of period 55,549 43,419
Supplemental disclosure of cash flow information Cash paid for:    
Interest 2,188 5,767
Income taxes 40,888 4,184
Supplemental Disclosure of Non-cash Investing and Financing Activities:    
Purchases of property and equipment included in accounts payable $ 1,604 66
ASU 2016-02    
Adoption of ASU 2016-02:    
Changes in other assets for operating lease obligations   7,535
Change in property and equipment   4,226
Changes in finance lease liabilities   (4,245)
Changes in lease liabilities for operating lease obligations   $ 7,497