Consolidated Statements of Stockholders' Equity - USD ($)	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock	Additional Paid-in Capital	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Treasury Stock
Increase (Decrease) in Temporary Equity [Roll Forward]
Convertible preferred stock issuance costs	$ 0
Establishment of initial convertible preferred stock purchase option liability	0
Beginning balance (in shares) at Jul. 31, 2019			39,276,161
Beginning balance (in shares) at Jul. 31, 2019							15,033,317
Beginning balance at Jul. 31, 2019	535,082,000		$ 3,928,000	$ 552,670,000	$ 420,333,000		$ (441,849,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity-classified stock award compensation	$ 9,275,000			9,275,000
Proceeds from exercises of stock options (in shares)	285,790		16,700
Proceeds from exercises of stock options	$ 468,000		$ 2,000	466,000
Proceeds from issuance of employee stock purchase plan shares (in shares)			52,958
Proceeds from issuance of employee stock purchase plan shares	855,000		$ 5,000	850,000
Issuance of restricted stock (in shares)			3,319
Issuance of restricted stock	0		$ 0	0
Net settlement of stock-based awards (in shares)			251,797
Net settlement of stock-based awards	(4,888,000)		$ 25,000	(4,913,000)
Common stock issued for acquisitions (in shares)			323,504
Common stock issued for acquisitions	11,575,000		$ 32,000	11,543,000
Cash dividends declared, net	(9,794,000)				(9,794,000)
Accrual of dividend equivalents, net of reversal	(294,000)				(294,000)
Net (loss) income	7,020,000				7,020,000
Ending balance (in shares) at Jul. 31, 2020			39,924,439
Ending balance (in shares) at Jul. 31, 2020							15,033,317
Ending balance at Jul. 31, 2020	549,299,000	$ (215,000)	$ 3,992,000	569,891,000	417,265,000	$ (215,000)	$ (441,849,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible List]		Accounting Standards Update 2016-13 [Member]
Convertible preferred stock issuance costs	0
Establishment of initial convertible preferred stock purchase option liability	0
Equity-classified stock award compensation	9,983,000			9,983,000
Proceeds from issuance of employee stock purchase plan shares (in shares)			54,762
Proceeds from issuance of employee stock purchase plan shares	809,000		$ 5,000	804,000
Issuance of restricted stock, net of forfeiture (in shares)			35,495
Issuance of restricted stock, net of forfeiture	0		$ 4,000	(4,000)
Net settlement of stock-based awards (in shares)			240,549
Net settlement of stock-based awards	(4,000,000)		$ 24,000	(4,024,000)
Common stock issued for acquisitions (in shares)			1,026,567
Common stock issued for acquisitions	28,892,000		$ 103,000	28,789,000
Cash dividends declared, net	(10,189,000)				(10,189,000)
Accrual of dividend equivalents, net of reversal	(380,000)				(380,000)
Net (loss) income	$ (73,480,000)				(73,480,000)
Ending balance (in shares) at Jul. 31, 2021	41,281,812		41,281,812
Ending balance (in shares) at Jul. 31, 2021							15,033,317
Ending balance at Jul. 31, 2021	$ 500,719,000		$ 4,128,000	605,439,000	333,001,000		$ (441,849,000)
Increase (Decrease) in Temporary Equity [Roll Forward]
Issuance of convertible preferred stock (in shares)	100,000
Issuance of convertible preferred stock	$ 100,000,000
Convertible preferred stock issuance costs	(4,007,000)
Establishment of initial convertible preferred stock purchase option liability	(1,005,000)
Adjustment to reflect redemption value of convertible preferred stock (including accrued dividends)	$ 10,216,000
Ending balance (in shares) at Jul. 31, 2022	100,000
Ending balance at Jul. 31, 2022	$ 105,204,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity-classified stock award compensation	7,767,000			7,767,000
CEO transition costs related to equity-classified stock-based awards (See Note 11)	$ 7,388,000			7,388,000
Proceeds from exercises of stock options (in shares)	1,220
Proceeds from issuance of employee stock purchase plan shares (in shares)			49,138
Proceeds from issuance of employee stock purchase plan shares	$ 730,000		$ 5,000	725,000
Issuance of restricted stock, net of forfeiture (in shares)			132,854
Issuance of restricted stock, net of forfeiture	0		$ 13,000	(13,000)
Net settlement of stock-based awards (in shares)			247,721
Net settlement of stock-based awards	(4,615,000)		$ 25,000	(4,640,000)
Common stock issued for acquisitions (in shares)			961,302
Common stock issued for acquisitions	8,914,000		$ 96,000	8,818,000
Adjustment to reflect redemption value of convertible preferred stock (including accrued dividends)	(10,216,000)				(10,216,000)
Cash dividends declared, net	(10,661,000)				(10,661,000)
Accrual of dividend equivalents, net of reversal	(389,000)				(389,000)
Net (loss) income	$ (33,052,000)				(33,052,000)
Ending balance (in shares) at Jul. 31, 2022	42,672,827		42,672,827
Ending balance (in shares) at Jul. 31, 2022							15,033,317
Ending balance at Jul. 31, 2022	$ 466,585,000		$ 4,267,000	$ 625,484,000	$ 278,683,000		$ (441,849,000)