CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2019	Apr. 30, 2018
Income Statement [Abstract]
Net revenue	$ 194,003	$ 193,921	$ 615,359	$ 450,181
Cost of revenue	157,142	154,916	502,755	386,279
Gross profit	36,861	39,005	112,604	63,902
Operating expenses
Selling, general and administrative	27,426	29,661	81,702	72,676
Amortization of intangible assets	7,278	7,964	23,168	12,071
Gain on sale of property	0	0	(85)	(12,692)
Total operating expenses	34,704	37,625	104,785	72,055
Operating income (loss)	2,157	1,380	7,819	(8,153)
Other income (expense):
Interest income	22	174	517	430
Interest expense	(10,294)	(10,680)	(32,335)	(19,362)
Other losses, net	(114)	(692)	(832)	(987)
Total other expense	(10,386)	(11,198)	(32,650)	(19,919)
Loss before income taxes	(8,229)	(9,818)	(24,831)	(28,072)
Income tax expense (benefit)	1,420	715	3,956	(71,719)
Gains on investments in affiliates, net of tax	(22)	(200)	(42)	(601)
Net income (loss)	(9,627)	(10,333)	(28,745)	44,248
Less: Preferred dividends on redeemable preferred stock	(525)	(529)	(1,598)	(799)
Net income (loss) attributable to common stockholders	$ (10,152)	$ (10,862)	$ (30,343)	$ 43,449
Basic net earnings (loss) per share attributable to common stockholders (usd per share)	$ (0.17)	$ (0.18)	$ (0.50)	$ 0.75
Diluted net earnings (loss) per share attributable to common stockholders (usd per share)	$ (0.17)	$ (0.18)	$ (0.50)	$ 0.63
Weighted average common shares used in:
Basic earnings per share (in shares)	61,393	60,076	61,111	58,281
Diluted earnings per share (in shares)	61,393	60,076	61,111	78,934