Segment Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2017	Apr. 30, 2016	Jul. 31, 2016
Segment Reporting Information [Line Items]
Net sales	$ 127,792,000	$ 124,187,000	$ 402,606,000	$ 258,627,000
Operating income (loss)	10,150,000	(13,397,000)	22,271,000	(8,040,000)
Net income (loss)	4,417,000	(14,355,000)	8,513,000	(10,440,000)
Provision for (benefit from) income taxes	2,884,000	(2,510,000)	4,808,000	(994,000)
Interest (income) and other expense	88,000	(5,000)	12,000	(227,000)
Interest expense	2,761,000	3,473,000	8,938,000	3,621,000
Amortization of stock-based compensation	991,000	1,041,000	2,980,000	3,166,000
Amortization of intangibles	5,468,000	4,776,000	17,555,000	7,348,000
Depreciation	3,532,000	3,082,000	10,849,000	6,078,000
Settlement of intellectual property litigation	(2,041,000)	0	(12,020,000)	0
Acquisition plan expenses	0	16,960,000	0	20,689,000
Adjusted EBITDA	18,100,000	12,462,000	41,635,000	29,241,000
Purchases of property, plant and equipment	2,076,000	1,600,000	6,223,000	3,063,000
Long-lived assets acquired in connection with the TCS acquisition		434,769,000		434,769,000
Total assets	863,758,000	903,328,000	863,758,000	903,328,000	$ 921,196,000
Secured Credit Facility
Segment Reporting Information [Line Items]
Interest expense related to Credit Facility	2,641,000	2,981,000	8,524,000	2,981,000
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Net sales	0	0	0	0
Operating income (loss)	204,000	(25,586,000)	(1,475,000)	(37,477,000)
Net income (loss)	(5,403,000)	(26,426,000)	(14,915,000)	(39,484,000)
Provision for (benefit from) income taxes	2,857,000	(2,512,000)	4,623,000	(1,088,000)
Interest (income) and other expense	37,000	(53,000)	49,000	(310,000)
Interest expense	2,713,000	3,405,000	8,768,000	3,405,000
Amortization of stock-based compensation	991,000	1,041,000	2,980,000	3,166,000
Amortization of intangibles	0	0	0	0
Depreciation	355,000	305,000	1,153,000	321,000
Settlement of intellectual property litigation	(2,041,000)		(12,020,000)
Acquisition plan expenses		16,960,000		20,689,000
Adjusted EBITDA	(491,000)	(7,280,000)	(9,362,000)	(13,301,000)
Purchases of property, plant and equipment	4,000	339,000	81,000	354,000
Long-lived assets acquired in connection with the TCS acquisition		4,359,000		4,359,000
Total assets	59,779,000	77,803,000	59,779,000	77,803,000
Commercial Solutions Segment | Operating Segments
Segment Reporting Information [Line Items]
Net sales	79,409,000	71,985,000	237,690,000	165,657,000
Operating income (loss)	8,633,000	6,560,000	17,595,000	14,048,000
Net income (loss)	8,506,000	6,437,000	17,249,000	13,635,000
Provision for (benefit from) income taxes	27,000	2,000	185,000	94,000
Interest (income) and other expense	51,000	53,000	(11,000)	103,000
Interest expense	49,000	68,000	172,000	216,000
Amortization of stock-based compensation	0	0	0	0
Amortization of intangibles	4,425,000	3,622,000	13,274,000	6,194,000
Depreciation	2,425,000	2,130,000	7,441,000	4,568,000
Settlement of intellectual property litigation	0		0
Acquisition plan expenses		0		0
Adjusted EBITDA	15,483,000	12,312,000	38,310,000	24,810,000
Purchases of property, plant and equipment	1,893,000	1,119,000	5,540,000	2,067,000
Long-lived assets acquired in connection with the TCS acquisition		353,729,000		353,729,000
Total assets	619,215,000	616,247,000	619,215,000	616,247,000
Commercial Solutions Segment | Intersegment Eliminations
Segment Reporting Information [Line Items]
Intersegment sales	2,812,000	2,198,000	9,297,000	4,082,000
Government Solutions Segment | Operating Segments
Segment Reporting Information [Line Items]
Net sales	48,383,000	52,202,000	164,916,000	92,970,000
Operating income (loss)	1,313,000	5,629,000	6,151,000	15,389,000
Net income (loss)	1,314,000	5,634,000	6,179,000	15,409,000
Provision for (benefit from) income taxes	0	0	0	0
Interest (income) and other expense	0	(5,000)	(26,000)	(20,000)
Interest expense	(1,000)	0	(2,000)	0
Amortization of stock-based compensation	0	0	0	0
Amortization of intangibles	1,043,000	1,154,000	4,281,000	1,154,000
Depreciation	752,000	647,000	2,255,000	1,189,000
Settlement of intellectual property litigation	0		0
Acquisition plan expenses		0		0
Adjusted EBITDA	3,108,000	7,430,000	12,687,000	17,732,000
Purchases of property, plant and equipment	179,000	142,000	602,000	642,000
Long-lived assets acquired in connection with the TCS acquisition		76,681,000		76,681,000
Total assets	$ 184,764,000	$ 209,278,000	$ 184,764,000	$ 209,278,000