Acquisition Narrative (Details) - USD ($)		3 Months Ended		6 Months Ended		18 Months Ended
	Feb. 23, 2016	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2017
Business Acquisition [Line Items]
Repayments of debt assumed in connection with the acquisition	$ 134,101,000
Acquisition plan expenses			$ 2,337,000		$ 3,729,000
Secured Credit Facility
Business Acquisition [Line Items]
Secured credit facility, maximum borrowing capacity	400,000,000
TeleCommunication Systems Inc.
Business Acquisition [Line Items]
Preliminary aggregate purchase price	340,432,000
Enterprise value	423,629,000
Fair value of consideration transferred, net of cash acquired	280,535,000
Cash acquired from the acquisition	59,897,000
Transaction and merger related expenditures	$ 48,000,000
Acquisition plan expenses		$ 0	$ 2,337,000	$ 0	$ 3,729,000	$ 21,276,000
Net sales from the acquisition		$ 75,885,000		$ 153,885,000