CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Oct. 31, 2019	Oct. 31, 2018
Income Statement [Abstract]
Net revenue	$ 225,153	$ 215,133
Cost of revenue	180,907	176,933
Gross profit	44,246	38,200
Operating expenses:
Selling, general and administrative	22,227	26,565
Amortization of intangible assets	7,277	8,099
Total operating expenses	29,504	34,664
Operating income	14,742	3,536
Other income (expense):
Interest income	16	323
Interest expense	(9,169)	(11,057)
Other gains, net	558	944
Total other expense	(8,595)	(9,790)
Income (loss) before income taxes	6,147	(6,254)
Income tax expense	1,355	1,131
Gains on investments in affiliates, net of tax	0	(20)
Net income (loss)	4,792	(7,365)
Less: Preferred dividends on redeemable preferred stock	(536)	(536)
Net income (loss) attributable to common stockholders	$ 4,256	$ (7,901)
Basic net earnings (loss) per share attributable to common stockholders	$ 0.07	$ (0.13)
Diluted net earnings (loss) per share attributable to common stockholders	$ 0.06	$ (0.13)
Weighted average common shares used in:
Basic earnings (loss) per share	61,401	60,712
Diluted earnings (loss) per share	86,006	60,712