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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Jan. 31, 2021
Jan. 31, 2020
Cash flows from operating activities:    
Income from continuing operations $ 154,679 $ 6,755
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 24,133 24,320
Loss on sale/disposition of assets 148 310
Provision for losses on notes and accounts receivable (693) (98)
Deferred income taxes 316 (18)
Change in fair value of contingent consideration   100
Stock-based compensation expense 3,392 941
Changes in operating assets and liabilities:    
Accounts receivable 8 (8,503)
Inventories 19,295 (31,687)
Prepaid expenses and other current assets (1,018) (3,797)
Income taxes (12,831) (2,196)
Accounts payable 17,299 (2,398)
Accrued payroll and incentives 2,040 (6,754)
Accrued profit sharing 8,663 (1,006)
Accrued expenses and deferred revenue (19,950) (1,584)
Accrued warranty 421 (526)
Other assets 1,226 1,281
Other non-current liabilities 1,309 (1,777)
Cash provided by/(used in) operating activities - continuing operations 198,437 (26,637)
Cash used in/(provided by) operating activities - discontinued operations (2,129) 1,804
Net cash provided by/(used in) operating activities 196,308 (24,833)
Cash flows from investing activities:    
Refunds on machinery and equipment 310  
Payments to acquire patents and software (502) (303)
Payments to acquire property and equipment (18,378) (10,504)
Cash used by investing activities - continuing operations (18,570) (10,807)
Cash used by investing activities - discontinued operations (1,143) (1,495)
Net cash used in investing activities (19,713) (12,302)
Cash flows from financing activities:    
Proceeds from loans and notes payable 25,000 228,225
Cash paid for debt issuance costs (450) (875)
Payments on finance lease obligation (736) (663)
Payments on notes and loans payable (185,000) (184,600)
Distribution to discontinued operations (25,000)  
Payments to acquire treasury stock (50,000)  
Dividend distribution (5,594)  
Proceeds from exercise of options to acquire common stock, including employee stock purchase plan 2,217 936
Payment of employee withholding tax related to restricted stock units (2,201) (594)
Cash (used in)/provided by financing activities - continuing operations (241,764) 42,429
Cash used in financing activities - discontinued operations (166)  
Net cash (used in)/provided by financing activities (241,930) 42,429
Net (decrease)/increase in cash and cash equivalents (65,335) 5,294
Cash and cash equivalents, beginning of period 125,011 40,853
Cash and cash equivalents, end of period 59,676 46,147
Supplemental disclosure of cash flow information Cash paid for:    
Interest 2,745 8,422
Income taxes 63,525 5,755
Supplemental Disclosure of Non-cash Investing and Financing Activities:    
Purchases of property and equipment included in accounts payable 817 436
Machinery and equipment on deposit placed into service $ 1,855  
ASU 2016-02    
Supplemental disclosure of cash flow information Cash paid for:    
Changes in other assets for operating lease obligations   11,821
Change in property and equipment   3,276
Changes in finance lease liabilities   (4,245)
Changes in lease liabilities for operating lease obligations   $ 12,790