Condensed Consolidated Statements of Cash Flows - USD ($)	3 Months Ended
	Oct. 31, 2021	Oct. 31, 2020
Cash flows from operating activities:
Net loss	$ (5,984,000)	$ (85,840,000)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization of property, plant and equipment	2,241,000	2,552,000
Amortization of intangible assets with finite lives	5,349,000	5,566,000
Amortization of stock-based compensation	921,000	699,000
Amortization of deferred financing costs	203,000	184,000
Change in fair value of convertible preferred stock purchase option liability	(304,000)	0
Changes in other liabilities	(1,033,000)	(1,033,000)
(Benefit from) provision for allowance for doubtful accounts	(156,000)	110,000
Provision for excess and obsolete inventory	1,175,000	1,003,000
Deferred income tax expense	175,000	816,000
Other	0	(225,000)
Changes in assets and liabilities, net of effects of business acquisitions:
Accounts receivable	21,450,000	(5,784,000)
Inventories	(8,513,000)	(101,000)
Prepaid expenses and other current assets	1,507,000	(5,247,000)
Other assets	(537,000)	45,000
Accounts payable	(6,353,000)	1,133,000
Accrued expenses and other current liabilities	814,000	7,031,000
Contract liabilities	(3,503,000)	4,274,000
Other liabilities, non-current	(2,000)	2,358,000
Interest payable	(66,000)	1,307,000
Income taxes payable	(2,605,000)	(3,077,000)
Net cash provided by (used in) operating activities	4,779,000	(74,229,000)
Cash flows from investing activities:
Purchases of property, plant and equipment	(3,638,000)	(890,000)
Net cash used in investing activities	(3,638,000)	(890,000)
Cash flows from financing activities:
Proceeds from issuance of convertible preferred stock	100,000,000	0
Net (payments) borrowings of long-term debt under Credit Facility	(93,000,000)	67,500,000
Remittance of employees' statutory tax withholding for stock awards	(4,723,000)	(2,737,000)
Cash dividends paid on common stock	(2,916,000)	(5,236,000)
Payment of convertible preferred stock issuance costs	(530,000)	0
Payment of deferred financing costs	(140,000)	0
Repayment of principal amounts under finance lease liabilities	(5,000)	0
Proceeds from issuance of employee stock purchase plan shares	229,000	182,000
Net cash (used in) provided by financing activities	(1,085,000)	59,709,000
Net increase (decrease) in cash and cash equivalents	56,000	(15,410,000)
Cash and cash equivalents at beginning of period	30,861,000	47,878,000
Cash and cash equivalents at end of period	30,917,000	32,468,000
Cash paid (received) during the period for:
Interest	1,345,000	786,000
Income taxes, net	387,000	22,000
Non-cash investing and financing activities:
Unpaid additions to property, plant and equipment	1,878,000	1,489,000
Cash dividends declared on common stock but unpaid (including accrual of dividend equivalents)	2,717,000	142,000
Unpaid convertible preferred stock issuance costs	3,477,000
Establishment of initial convertible preferred stock purchase option liability	1,005,000	0
Adjustment to reflect redemption value of convertible preferred stock	$ 5,247,000	$ 0