Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Jul. 31, 2023	Jul. 31, 2022	Jul. 31, 2021
Cash flows from operating activities:
Net loss	$ (26,899,000)	$ (33,052,000)	$ (73,480,000)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:
Depreciation and amortization of property, plant and equipment	11,922,000	10,314,000	9,379,000
Amortization of intangible assets with finite lives	21,396,000	21,396,000	21,020,000
Amortization of stock-based compensation	10,107,000	7,767,000	9,983,000
Amortization of cost to fulfill assets	959,000	469,000	0
CEO transition costs related to equity-classified stock-based awards	3,764,000	7,388,000	0
Amortization of deferred financing costs	1,852,000	811,000	736,000
Change in fair value of convertible preferred stock purchase option liability	0	(1,005,000)	0
Changes in other liabilities	(4,133,000)	(4,132,000)	(6,633,000)
Loss (gain) on disposal of property, plant and equipment	48,000	(310,000)	215,000
Provision for (benefit from) allowance for doubtful accounts	261,000	838,000	(18,000)
Provision for excess and obsolete inventory	4,871,000	4,447,000	4,364,000
Deferred income tax benefit	(6,060,000)	(5,856,000)	(3,263,000)
Other	0	0	(225,000)
Changes in assets and liabilities, net of effects of business acquisitions:
Accounts receivable	(39,709,000)	33,567,000	(31,223,000)
Inventories	(14,885,000)	(20,406,000)	(2,338,000)
Prepaid expenses and other current assets	1,656,000	(3,190,000)	(265,000)
Other assets	(3,356,000)	(6,656,000)	(4,215,000)
Accounts payable	20,362,000	6,833,000	11,016,000
Accrued expenses and other current liabilities	671,000	(11,081,000)	(7,886,000)
Contract liabilities	10,194,000	(1,362,000)	25,444,000
Other liabilities, non-current	(324,000)	(3,690,000)	3,583,000
Interest payable	1,197,000	(22,000)	32,000
Income taxes payable	1,673,000	(1,071,000)	3,136,000
Net cash (used in) provided by operating activities	(4,433,000)	1,997,000	(40,638,000)
Cash flows from investing activities:
Net cash acquired from acquisition of UHP	0	0	1,304,000
Purchases of property, plant and equipment	(18,311,000)	(19,619,000)	(16,037,000)
Net cash used in investing activities	(18,311,000)	(19,619,000)	(15,483,000)
Cash flows from financing activities:
Net borrowings (payments) of long-term debt under Revolving Loan Facility	36,900,000	(71,000,000)	51,500,000
Cash dividends paid on common stock	(8,661,000)	(11,048,000)	(10,334,000)
Payment of deferred financing costs	(3,809,000)	(140,000)	(30,000)
Remittance of employees' statutory tax withholding for stock awards	(2,869,000)	(6,109,000)	(2,803,000)
Repayment of debt under Term Loan	1,875,000	0	0
Proceeds from issuance of employee stock purchase plan shares	470,000	734,000	809,000
Repayment of principal amounts under finance lease and other obligations	(4,000)	(15,000)	(38,000)
Proceeds from issuance of convertible preferred stock	0	100,000,000	0
Net cash provided by financing activities	20,051,000	8,415,000	39,104,000
Net decrease in cash and cash equivalents	(2,693,000)	(9,207,000)	(17,017,000)
Cash and cash equivalents at beginning of year	21,654,000	30,861,000	47,878,000
Cash and cash equivalents at end of year	18,961,000	21,654,000	30,861,000
Supplemental cash flow disclosure
Interest	11,914,000	4,094,000	5,987,000
Income taxes, net	361,000	2,913,000	(1,373,000)
Non-cash investing and financing activities:
Accrued remittance of employees' statutory tax withholdings for fully-vested share units	1,204,000	1,102,000	2,596,000
Cash dividends declared on common stock but unpaid (including accrual of dividend equivalents)	315,000	3,135,000	2,981,000
Adjustment to reflect redemption value of convertible preferred stock	7,007,000	10,216,000	0
Establishment of initial convertible preferred stock purchase option liability	0	1,005,000	0
Accrued additions to property, plant and equipment	993,000	5,586,000	2,466,000
Issuance of restricted stock	9,000	13,000	4,000
Common stock issued for acquisitions	0	9,000,000	28,892,000
Accrued deferred financing costs	0	0	139,000
Shelf Registration
Cash flows from financing activities:
Payment of issuance cost	(101,000)	0	0
Convertible Preferred Stock
Cash flows from financing activities:
Payment of issuance cost	0	(4,007,000)	0
CGC
Cash flows from investing activities:
Payment for acquisition of CGC, net of cash acquired	0	0	(750,000)
UHP
Non-cash investing and financing activities:
Fair value of UHP acquisition contingent earn-out consideration	$ 0	$ 0	$ 8,500,000