CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2021	Apr. 30, 2020
Condensed Income Statements, Captions [Line Items]
Net revenues	$ 151,785	$ 177,351	$ 477,766	$ 617,956
Cost of revenue	119,538	143,881	369,201	494,991
Gross profit	32,247	33,470	108,565	122,965
Operating expenses:
Selling, general and administrative	21,405	25,872	70,073	79,264
Goodwill impairment charge	25,658	0	25,658	0
Amortization of intangible assets	4,182	6,531	16,076	20,719
Total operating expenses	51,245	32,403	111,807	99,983
Operating (loss) income	(18,998)	1,067	(3,242)	22,982
Other income (expense):
Interest income	1	8	21	38
Interest expense	(7,764)	(8,523)	(23,412)	(26,425)
Other gains (losses), net	152	2,774	(4,028)	2,509
Total other expense, net	(7,611)	(5,741)	(27,419)	(23,878)
Loss before income taxes	(26,609)	(4,674)	(30,661)	(896)
Income tax expense	1,020	1,485	2,715	4,028
Net loss	(27,629)	(6,159)	(33,376)	(4,924)
Less: Preferred dividends on redeemable preferred stock	(519)	(525)	(1,586)	(1,592)
Net loss attributable to common stockholders	$ (28,148)	$ (6,684)	$ (34,962)	$ (6,516)
Basic net loss per share attributable to common stockholders (in usd per share)	$ (0.45)	$ (0.11)	$ (0.56)	$ (0.11)
Diluted net loss per share attributable to common stockholders (in usd per share)	$ (0.45)	$ (0.11)	$ (0.56)	$ (0.11)
Weighted average common shares used in:
Basic loss per share (in shares)	62,263	61,815	61,898	61,583
Diluted loss per share (in shares)	62,263	61,815	61,898	61,583
Products
Condensed Income Statements, Captions [Line Items]
Net revenues	$ 102,351	$ 98,284	$ 299,214	$ 354,404
Cost of revenue	80,007	79,476	229,939	278,696
Services
Condensed Income Statements, Captions [Line Items]
Net revenues	49,434	79,067	178,552	263,552
Cost of revenue	$ 39,531	$ 64,405	$ 139,262	$ 216,295