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Acquisition Summary of Assets Acquired and Liabilities Assumed (Details) - USD ($)
Feb. 23, 2016
Apr. 30, 2016
Jan. 31, 2016
Jul. 31, 2015
Business Acquisition [Line Items]        
Goodwill   $ 264,503,000 $ 137,354,000 $ 137,354,000
TeleCommunication Systems, Inc.        
Business Acquisition [Line Items]        
Shares of TCS common stock purchased $ 318,605,000      
Stock-based awards settled 21,827,000      
Preliminary allocation of aggregate purchase price 340,432,000      
Cash and cash equivalents 59,897,000      
Current assets, excluding cash acquired 115,797,000      
Deferred tax assets, net, non-current 72,700,000      
Property, plant and equipment 26,720,000      
Other assets, non-current 2,641,000      
Current liabilities (excluding interest accrued on debt) (87,700,000)      
Debt (including interest accrued) (134,101,000)      
Capital lease obligations (8,993,000)      
Other liabilities (9,156,000)      
Net tangible assets at preliminary fair value 37,805,000      
Deferred tax liabilities related to intangible assets acquired (105,422,000)      
Goodwill 127,149,000 $ 127,149,000    
Preliminary allocation of aggregate purchase price 340,432,000      
Customer Relationships And Backlog [Member] | TeleCommunication Systems, Inc.        
Business Acquisition [Line Items]        
Intangible assets 225,900,000      
Trade Names [Member] | TeleCommunication Systems, Inc.        
Business Acquisition [Line Items]        
Intangible assets 20,000,000      
Technology [Member] | TeleCommunication Systems, Inc.        
Business Acquisition [Line Items]        
Intangible assets $ 35,000,000      
Minimum | Customer Relationships And Backlog [Member] | TeleCommunication Systems, Inc.        
Business Acquisition [Line Items]        
Estimated useful life (in years) 21 years      
Minimum | Trade Names [Member] | TeleCommunication Systems, Inc.        
Business Acquisition [Line Items]        
Estimated useful life (in years) 10 years      
Minimum | Technology [Member] | TeleCommunication Systems, Inc.        
Business Acquisition [Line Items]        
Estimated useful life (in years) 5 years      
Maximum | Customer Relationships And Backlog [Member] | TeleCommunication Systems, Inc.        
Business Acquisition [Line Items]        
Estimated useful life (in years) 22 years      
Maximum | Trade Names [Member] | TeleCommunication Systems, Inc.        
Business Acquisition [Line Items]        
Estimated useful life (in years) 20 years      
Maximum | Technology [Member] | TeleCommunication Systems, Inc.        
Business Acquisition [Line Items]        
Estimated useful life (in years) 15 years