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Segment Information (Details)
 3 Months Ended 6 Months Ended
Jan. 31, 2016
USD ($)
operating_segment
Jan. 31, 2017
USD ($)
operating_segment
Jan. 31, 2016
USD ($)
Jan. 31, 2017
USD ($)
operating_segment
Jan. 31, 2016
USD ($)
Jul. 31, 2016
USD ($)
Segment Reporting Information [Line Items]            
Number of reportable segments | operating_segment 3 2   2    
Net sales   $ 139,028,000 $ 70,323,000 $ 274,814,000 $ 134,440,000  
Operating income (loss)   12,849,000 3,189,000 12,121,000 5,357,000  
Net income   6,585,000 2,476,000 4,096,000 3,915,000  
Provision for income taxes   3,486,000 750,000 1,924,000 1,516,000  
Interest (income) and other expense   (74,000) (110,000) (76,000) (222,000)  
Interest expense   2,852,000 73,000 6,177,000 148,000  
Amortization of stock-based compensation   1,019,000 1,074,000 1,989,000 2,125,000  
Amortization of intangibles   6,032,000 1,196,000 12,087,000 2,572,000  
Depreciation   3,568,000 1,466,000 7,317,000 2,996,000  
Settlement of intellectual property litigation   (9,979,000) 0 (9,979,000) 0  
Acquisition plan expenses     2,337,000   3,729,000  
Adjusted EBITDA   13,489,000 9,262,000 23,535,000 16,779,000  
Purchases of property, plant and equipment   2,072,000 827,000 4,147,000 1,463,000  
Total assets $ 462,170,000 883,508,000 462,170,000 883,508,000 462,170,000 $ 921,196,000
Secured Credit Facility            
Segment Reporting Information [Line Items]            
Credit Facility Interest Expense For Period   2,708,000 0 5,883,000 0  
Corporate, Non-Segment [Member]            
Segment Reporting Information [Line Items]            
Net sales   0 0 0 0  
Operating income (loss)   4,647,000 (6,731,000) (1,679,000) (11,891,000)  
Net income   (1,507,000) (7,235,000) (9,512,000) (13,060,000)  
Provision for income taxes   3,351,000 634,000 1,766,000 1,424,000  
Interest (income) and other expense   9,000 (130,000) 12,000 (256,000)  
Interest expense   2,794,000 0 6,055,000 0  
Amortization of stock-based compensation   1,019,000 1,074,000 1,989,000 2,125,000  
Amortization of intangibles   0 0 0 0  
Depreciation   387,000 8,000 798,000 16,000  
Settlement of intellectual property litigation   (9,979,000)   (9,979,000)    
Acquisition plan expenses     2,337,000   3,729,000  
Adjusted EBITDA   (3,926,000) (3,312,000) (8,871,000) (6,022,000)  
Purchases of property, plant and equipment   7,000 13,000 77,000 15,000  
Total assets 156,474,000 66,326,000 156,474,000 66,326,000 156,474,000  
Commercial Solutions Segment | Operating Segments            
Segment Reporting Information [Line Items]            
Net sales   82,103,000 50,722,000 158,281,000 93,672,000  
Operating income (loss)   5,864,000 5,241,000 8,962,000 7,489,000  
Net income   5,730,000 5,023,000 8,743,000 7,200,000  
Provision for income taxes   135,000 116,000 158,000 92,000  
Interest (income) and other expense   (60,000) 29,000 (62,000) 50,000  
Interest expense   59,000 73,000 123,000 148,000  
Amortization of stock-based compensation   0 0 0 0  
Amortization of intangibles   4,413,000 1,196,000 8,849,000 2,572,000  
Depreciation   2,429,000 1,186,000 5,016,000 2,439,000  
Settlement of intellectual property litigation   0   0    
Acquisition plan expenses     0   0  
Adjusted EBITDA   12,706,000 7,623,000 22,827,000 12,501,000  
Purchases of property, plant and equipment   1,652,000 467,000 3,647,000 948,000  
Total assets 227,963,000 620,147,000 227,963,000 620,147,000 227,963,000  
Commercial Solutions Segment | Intersegment Eliminations            
Segment Reporting Information [Line Items]            
Intersegment sales   3,059,000 805,000 6,485,000 1,884,000  
Government Solutions Segment | Operating Segments            
Segment Reporting Information [Line Items]            
Net sales   56,925,000 19,601,000 116,533,000 40,768,000  
Operating income (loss)   2,338,000 4,679,000 4,838,000 9,759,000  
Net income   2,362,000 4,688,000 4,865,000 9,775,000  
Provision for income taxes   0 0 0 0  
Interest (income) and other expense   (23,000) (9,000) (26,000) (16,000)  
Interest expense   (1,000) 0 (1,000) 0  
Amortization of stock-based compensation   0 0 0 0  
Amortization of intangibles   1,619,000 0 3,238,000 0  
Depreciation   752,000 272,000 1,503,000 541,000  
Settlement of intellectual property litigation   0   0    
Acquisition plan expenses     0   0  
Adjusted EBITDA   4,709,000 4,951,000 9,579,000 10,300,000  
Purchases of property, plant and equipment   413,000 347,000 423,000 500,000  
Total assets $ 77,733,000 $ 197,035,000 $ 77,733,000 $ 197,035,000 $ 77,733,000