Acquisition (Details) - USD ($)		12 Months Ended
	Feb. 23, 2016	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2016
Business Acquisition [Line Items]
Fair value of consideration transferred, net of cash acquired		$ 0	$ 0	$ 280,535,000
Repayments of debt assumed in connection with the acquisition		0	0	134,101,000
Acquisition plan expenses		0	0	21,276,000
Secured Credit Facility
Business Acquisition [Line Items]
Line of 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
Repayments of debt assumed in connection with the acquisition	$ 134,101,000
Acquisition plan expenses		$ 0	$ 0	$ 21,276,000