CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2021	Jan. 31, 2020
Condensed Income Statements, Captions [Line Items]
Revenues	$ 156,047	$ 215,452	$ 325,981	$ 440,605
Cost of revenue	120,197	170,203	249,663	351,110
Gross profit	35,850	45,249	76,318	89,495
Operating expenses:
Selling, general and administrative	21,810	31,165	48,668	53,392
Amortization of intangible assets	5,359	6,911	11,894	14,188
Total operating expenses	27,169	38,076	60,562	67,580
Operating income	8,681	7,173	15,756	21,915
Other income (expense):
Interest income	0	14	20	30
Interest expense	(7,825)	(8,733)	(15,648)	(17,902)
Other losses, net	(2,161)	(823)	(4,180)	(265)
Total other expense	(9,986)	(9,542)	(19,808)	(18,137)
(Loss) income before income taxes	(1,305)	(2,369)	(4,052)	3,778
Income tax expense	891	1,188	1,695	2,543
Net (loss) income	(2,196)	(3,557)	(5,747)	1,235
Less: Preferred dividends on redeemable preferred stock	(530)	(531)	(1,067)	(1,067)
Net (loss) income attributable to common stockholders	$ (2,726)	$ (4,088)	$ (6,814)	$ 168
Basic net (loss) earnings per share attributable to common stockholders (in usd per share)	$ (0.04)	$ (0.07)	$ (0.11)	$ 0.00
Diluted net (loss) earnings per share attributable to common stockholders (in usd per share)	$ (0.04)	$ (0.07)	$ (0.11)	$ 0.00
Weighted average common shares used in:
Basic (loss) earnings per share (in shares)	62,028	61,538	61,961	61,469
Diluted (loss) earnings per share (in shares)	62,028	61,538	61,961	61,482
Products
Condensed Income Statements, Captions [Line Items]
Revenues	$ 91,155	$ 123,117	$ 196,863	$ 256,120
Cost of revenue	68,740	94,630	149,932	199,220
Services
Condensed Income Statements, Captions [Line Items]
Revenues	64,892	92,335	129,118	184,485
Cost of revenue	$ 51,457	$ 75,573	$ 99,731	$ 151,890