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Accrued Expenses and Other Current Liabilities (Details) - USD ($)
Jan. 31, 2017
Jul. 31, 2016
Jan. 31, 2016
Jul. 31, 2015
Business Acquisition [Line Items]        
Accrued wages and benefits $ 23,395,000 $ 23,394,000    
Accrued legal costs 19,909,000 32,469,000    
Accrued warranty obligations 19,014,000 15,362,000 $ 8,624,000 $ 8,638,000
Accrued acquisition-related costs 0 2,119,000    
Accrued contract costs 10,687,000 8,348,000    
Accrued commissions and royalties 3,233,000 3,473,000    
Other 12,557,000 12,869,000    
Accrued expenses and other current liabilities 88,795,000 98,034,000    
TeleCommunication Systems Inc. | Pre-Acquisition Contingencies Related to TCS Intellectual Property        
Business Acquisition [Line Items]        
Accrued legal costs 14,758,000 $ 28,112,000    
TeleCommunication Systems Inc. | TCS's 911 call handling software [Member]        
Business Acquisition [Line Items]        
Accrued warranty obligations $ 10,595,000