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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Jul. 31, 2021
Jul. 31, 2020
Cash flows from operating activities:    
Income from continuing operations $ 76,882 $ 43,301
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 7,466 8,244
Loss on sale/disposition of assets 57 3
Provision for losses on notes and accounts receivable (56) 38
Stock-based compensation expense 1,452 884
Changes in operating assets and liabilities:    
Accounts receivable 26,300 1,851
Inventories (18,663) 23,767
Prepaid expenses and other current assets (96) (973)
Income taxes 21,988 14,340
Accounts payable (2,443) 7,769
Accrued payroll and incentives (9,114) (1,664)
Accrued profit sharing 3,834 3,405
Accrued expenses and deferred revenue 405 (18,638)
Accrued warranty (297) (175)
Other assets 1,677 796
Other non-current liabilities (305) (1,225)
Cash provided by operating activities - continuing operations 109,087 81,723
Cash provided by operating activities - discontinued operations 0 2,507
Net cash provided by operating activities 109,087 84,230
Cash flows from investing activities:    
Payments to acquire patents and software (69) (187)
Proceeds from sale of property and equipment 70 0
Payments to acquire property and equipment (5,769) (6,465)
Cash used by investing activities - continuing operations (5,768) (6,652)
Cash used by investing activities - discontinued operations 0 (995)
Net cash used in investing activities (5,768) (7,647)
Cash flows from financing activities:    
Payments on finance lease obligation (264) (238)
Payments on notes and loans payable 0 (135,000)
Payments to acquire treasury stock (40,000) 0
Dividend distribution (3,844) 0
Proceeds from exercise of options to acquire common stock 0 268
Payment of employee withholding tax related to restricted stock units (815) (997)
Cash used in financing activities - continuing operations (44,923) (135,967)
Net cash used in by financing activities (44,923) (135,967)
Net increase/(decrease) in cash and cash equivalents 58,396 (59,384)
Cash and cash equivalents, beginning of period 113,017 125,011
Cash and cash equivalents, end of period 171,413 65,627
Supplemental disclosure of cash flow information Cash paid for:    
Interest 538 1,556
Income taxes 1,131 1,689
Supplemental Disclosure of Non-cash Investing and Financing Activities:    
Purchases of property and equipment included in accounts payable 435 986
Receivable for exercise of options to acquire common stock $ 0 $ 1,250