Condensed Consolidated Statements of Cash Flows - USD ($)	3 Months Ended
	Oct. 31, 2022	Oct. 31, 2021
Cash flows from operating activities:
Net loss	$ (11,096,000)	$ (5,984,000)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:
Depreciation and amortization of property, plant and equipment	2,798,000	2,241,000
Amortization of intangible assets with finite lives	5,349,000	5,349,000
Amortization of stock-based compensation	904,000	921,000
Amortization of cost to fulfill assets	240,000	0
CEO transition costs related to equity-classified stock-based awards	3,764,000	0
Amortization of deferred financing costs	203,000	203,000
Change in fair value of convertible preferred stock purchase option liability	0	(304,000)
Changes in other liabilities	(1,033,000)	(1,033,000)
Loss on disposal of property, plant and equipment	71,000	0
Provision for (benefit from) allowance for doubtful accounts	242,000	(156,000)
Provision for excess and obsolete inventory	847,000	1,175,000
Deferred income tax (benefit) expense	(1,217,000)	175,000
Changes in assets and liabilities, net of effects of business acquisitions:
Accounts receivable	(5,318,000)	21,450,000
Inventories	(4,278,000)	(8,513,000)
Prepaid expenses and other current assets	1,581,000	1,507,000
Other assets	(714,000)	(537,000)
Accounts payable	(1,555,000)	(6,353,000)
Accrued expenses and other current liabilities	5,256,000	814,000
Contract liabilities	(3,048,000)	(3,503,000)
Other liabilities, non-current	(61,000)	(2,000)
Interest payable	78,000	(66,000)
Income taxes payable	790,000	(2,605,000)
Net cash (used in) provided by operating activities	(6,197,000)	4,779,000
Cash flows from investing activities:
Purchases of property, plant and equipment	(7,221,000)	(3,638,000)
Net cash used in investing activities	(7,221,000)	(3,638,000)
Cash flows from financing activities:
Proceeds from issuance of convertible preferred stock	0	100,000,000
Net borrowings (payments) of long-term debt under Credit Facility	18,700,000	(93,000,000)
Remittance of employees' statutory tax withholding for stock awards	(2,332,000)	(4,723,000)
Cash dividends paid on common stock	(3,092,000)	(2,916,000)
Payment of deferred financing costs	0	(140,000)
Repayment of principal amounts under finance lease liabilities	(2,000)	(5,000)
Proceeds from issuance of employee stock purchase plan shares	119,000	229,000
Net cash provided by (used in) financing activities	13,292,000	(1,085,000)
Net (decrease) increase in cash and cash equivalents	(126,000)	56,000
Cash and cash equivalents at beginning of period	21,654,000	30,861,000
Cash and cash equivalents at end of period	21,528,000	30,917,000
Cash paid (received) during the period for:
Interest	1,947,000	1,345,000
Income taxes, net	(181,000)	387,000
Non-cash investing and financing activities:
Accrued additions to property, plant and equipment	1,818,000	1,878,000
Cash dividends declared on common stock but unpaid (including accrual of dividend equivalents)	2,975,000	2,717,000
Accrued convertible preferred stock issuance costs	0	3,477,000
Reclass of finance lease right-of-use assets to property, plant and equipment	12,000	0
Establishment of initial convertible preferred stock purchase option liability	0	1,005,000
Adjustment to reflect redemption value of convertible preferred stock	1,710,000	5,247,000
Convertible Preferred Stock
Cash flows from financing activities:
Payment of issuance costs	0	(530,000)
Shelf Registration
Cash flows from financing activities:
Payment of issuance costs	$ (101,000)	$ 0