CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Apr. 30, 2020	Apr. 30, 2019	Apr. 30, 2020	Apr. 30, 2019
Condensed Income Statements, Captions [Line Items]
Revenues	$ 177,351	$ 194,003	$ 617,956	$ 615,359
Cost of revenue	143,881	157,142	494,991	502,755
Gross profit	33,470	36,861	122,965	112,604
Operating expenses:
Selling, general and administrative	25,872	27,426	79,264	81,617
Amortization of intangible assets	6,531	7,278	20,719	23,168
Total operating expenses	32,403	34,704	99,983	104,785
Operating income	1,067	2,157	22,982	7,819
Other income (expense):
Interest income	8	22	38	517
Interest expense	(8,523)	(10,294)	(26,425)	(32,335)
Other gains (losses), net	2,774	(114)	2,509	(832)
Total other expense	(5,741)	(10,386)	(23,878)	(32,650)
Loss before income taxes	(4,674)	(8,229)	(896)	(24,831)
Income tax expense	1,485	1,420	4,028	3,956
Gains on investments in affiliates, net of tax	0	(22)	0	(42)
Net loss	(6,159)	(9,627)	(4,924)	(28,745)
Less: Preferred dividends on redeemable preferred stock	(525)	(525)	(1,592)	(1,598)
Net loss attributable to common stockholders	$ (6,684)	$ (10,152)	$ (6,516)	$ (30,343)
Basic net earnings (loss) per share attributable to common stockholders (in usd per share)	$ (0.11)	$ (0.17)	$ (0.11)	$ (0.50)
Diluted net earnings (loss) per share attributable to common stockholders (in usd per share)	$ (0.11)	$ (0.17)	$ (0.11)	$ (0.50)
Weighted average common shares used in:
Basic earnings (loss) per share (in shares)	61,815	61,393	61,583	61,111
Diluted earnings (loss) per share (in shares)	61,815	61,393	61,583	61,111
Products
Condensed Income Statements, Captions [Line Items]
Revenues	$ 98,284	$ 116,006	$ 354,404	$ 362,547
Services
Condensed Income Statements, Captions [Line Items]
Revenues	$ 79,067	$ 77,997	$ 263,552	$ 252,812