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Acquisition Summary of Assets Acquired and Liabilities Assumed (Details) - USD ($)
Feb. 23, 2016
Apr. 30, 2017
Jul. 31, 2016
Business Acquisition [Line Items]      
Goodwill   $ 290,633,000 $ 287,618,000
TeleCommunication Systems Inc.      
Business Acquisition [Line Items]      
Allocation of aggregate purchase price $ 340,432,000    
Customer relationships and backlog | TeleCommunication Systems Inc.      
Business Acquisition [Line Items]      
Estimated useful life (in years) 21 years    
Minimum | Trade names | TeleCommunication Systems Inc.      
Business Acquisition [Line Items]      
Estimated useful life (in years) 10 years    
Minimum | Technology | TeleCommunication Systems Inc.      
Business Acquisition [Line Items]      
Estimated useful life (in years) 5 years    
Maximum | Trade names | TeleCommunication Systems Inc.      
Business Acquisition [Line Items]      
Estimated useful life (in years) 20 years    
Maximum | Technology | TeleCommunication Systems Inc.      
Business Acquisition [Line Items]      
Estimated useful life (in years) 15 years    
Purchase Price Allocation | TeleCommunication Systems Inc.      
Business Acquisition [Line Items]      
Shares of TCS common stock purchased $ 318,605,000    
Stock-based awards settled 21,827,000    
Allocation of aggregate purchase price 340,432,000    
Cash and cash equivalents 59,897,000    
Current assets 115,913,000    
Deferred tax assets, net, non-current 85,490,000    
Property, plant and equipment 25,689,000    
Other assets, non-current 2,641,000    
Current liabilities (excluding interest accrued on debt) (123,956,000)    
Debt (including interest accrued) (134,101,000)    
Capital lease obligations (8,993,000)    
Other liabilities (9,156,000)    
Net tangible assets at fair value 13,424,000    
Deferred tax liabilities (104,371,000)    
Goodwill 153,279,000    
Allocation of aggregate purchase price 340,432,000    
Purchase Price Allocation | Customer relationships and backlog | TeleCommunication Systems Inc.      
Business Acquisition [Line Items]      
Intangible assets 223,100,000    
Purchase Price Allocation | Trade names | TeleCommunication Systems Inc.      
Business Acquisition [Line Items]      
Intangible assets 20,000,000    
Purchase Price Allocation | Technology | TeleCommunication Systems Inc.      
Business Acquisition [Line Items]      
Intangible assets $ 35,000,000