CONSOLIDATED AND COMBINED STATEMENTS OF CASH FLOWS - USD ($)	12 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2019
Cash flows from operating activities:
Net income/(loss)	$ 18,405,000	$ (96,201,000)	$ (9,521,000)
Adjustments to reconcile net income/(loss) to net cash provided by operating activities:
Depreciation and amortization	19,827,000	23,639,000	24,990,000
Loss on sale/disposition of assets	107,000	819,000	113,000
Provision for losses on accounts receivable	(48,000)	688,000	33,000
Impairment of long-lived tangible assets		720,000
Goodwill impairment	0	98,929,000	10,396,000
Deferred income taxes	(3,103,000)	(12,499,000)	(2,816,000)
Change in fair value of contingent consideration			(60,000)
Stock-based compensation expense	2,910,000	850,000	2,274,000
Changes in operating assets and liabilities:
Accounts receivable	(7,117,000)	(8,763,000)	135,000
Inventories	(14,297,000)	942,000	(18,358,000)
Prepaid expenses and other current assets	(1,042,000)	(250,000)	(1,629,000)
Income taxes	(45,000)	(132,000)	82,000
Accounts payable	7,632,000	12,000	(1,473,000)
Accrued payroll and incentives	4,751,000	(1,397,000)	2,159,000
Right of use assets	1,337,000	939,000
Accrued profit sharing	1,716,000	(61,000)	161,000
Accrued expenses	3,691,000	1,434,000	(2,471,000)
Other assets	9,000	(55,000)	9,000
Lease liabilities	(1,543,000)	(1,146,000)
Other non-current liabilities	130,000	(21,000)	(211,000)
Net cash provided by operating activities	33,320,000	8,447,000	3,813,000
Cash flows from investing activities:
Acquisition of businesses, net of cash acquired			(1,772,000)
Payments to acquire patents and software	(558,000)	(383,000)	(863,000)
Payments to acquire property and equipment	(3,623,000)	(1,480,000)	(1,889,000)
Net cash used in investing activities	(4,181,000)	(1,863,000)	(4,524,000)
Cash flows from financing activities:
Net transfers from/(to) former Parent	31,485,000	(6,512,000)	873,000
Cash paid for debt issuance costs	(410,000)
Proceeds from exercise of options to acquire common stock, including employee stock purchase plan	386,000
Payment of employee withholding tax related to restricted stock units	(33,000)
Net cash provided by/(used in) financing activities	31,428,000	(6,512,000)	873,000
Net increase in cash and cash equivalents	60,567,000	72,000	162,000
Cash and cash equivalents, beginning of period	234,000	162,000
Cash and cash equivalents, end of period	60,801,000	234,000	$ 162,000
Supplemental disclosure of cash flow information Cash paid for:
Interest	111,000
Income taxes	7,951,000
Supplemental Disclosure of Non-cash Investing and Financing Activities:
Purchases of property and equipment included in accounts payable	254,000	54,000
Non-cash transfers to/from former Parent	1,398,000
Changes in right of use assets for operating lease obligations	23,940,000	3,369,000
Changes in lease liabilities for operating lease obligations	$ 23,940,000	$ 4,449,000