Acquisition Summary of Assets Acquired and Liabilities Assumed (Details) - USD ($)		Feb. 23, 2016	Jan. 31, 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	[1]	$ 318,605,000
Stock-based awards settled	[1]	21,827,000
Allocation of aggregate purchase price	[1]	340,432,000
Cash and cash equivalents	[1]	59,897,000
Current assets	[1]	115,996,000
Deferred tax assets, net, non-current	[1]	83,431,000
Property, plant and equipment	[1]	25,689,000
Other assets, non-current	[1]	2,641,000
Current liabilities (excluding interest accrued on debt)	[1]	(119,756,000)
Debt (including interest accrued)	[1]	(134,101,000)
Capital lease obligations	[1]	(8,993,000)
Other liabilities	[1]	(9,156,000)
Net tangible assets at fair value	[1]	15,648,000
Deferred tax liabilities	[1]	(104,371,000)
Goodwill	[1]	151,055,000
Allocation of aggregate purchase price	[1]	340,432,000
Purchase Price Allocation | Customer relationships and backlog | TeleCommunication Systems Inc.
Business Acquisition [Line Items]
Intangible assets	[1]	223,100,000
Purchase Price Allocation | Trade names | TeleCommunication Systems Inc.
Business Acquisition [Line Items]
Intangible assets	[1]	20,000,000
Purchase Price Allocation | Technology | TeleCommunication Systems Inc.
Business Acquisition [Line Items]
Intangible assets	[1]	35,000,000
Measurement Period Adjustments | TeleCommunication Systems Inc.
Business Acquisition [Line Items]
Current assets	[2]	(83,000)
Deferred tax assets, net, non-current	[2]	2,059,000
Property, plant and equipment	[2]	0
Current liabilities (excluding interest accrued on debt)		(4,200,000)
Net tangible assets at fair value	[2]	(2,224,000)
Goodwill	[2]	2,224,000
Purchase Price Allocation (as adjusted) | 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 (as adjusted) | Customer relationships and backlog | TeleCommunication Systems Inc.
Business Acquisition [Line Items]
Intangible assets		223,100,000
Purchase Price Allocation (as adjusted) | Trade names | TeleCommunication Systems Inc.
Business Acquisition [Line Items]
Intangible assets		20,000,000
Purchase Price Allocation (as adjusted) | Technology | TeleCommunication Systems Inc.
Business Acquisition [Line Items]
Intangible assets		$ 35,000,000

[1] As reported in the Company's Quarterly Report on Form 10-Q for the three months ended October 31, 2016.

[2] Principally relates to the finalization of: (i) the estimated fair value of TCS's 911 call handling software warranty obligations; (ii) TCS's income tax returns for the pre-acquisition period which began January 1, 2016 and ended February 23, 2016; and (iii) the related adjustments to deferred income taxes. These measurement period adjustments were recorded to reflect final determinations of estimated fair values of the assets acquired and the liabilities assumed in connection with the TCS acquisition based on facts and circumstances that existed as of the acquisition date.