Description of Business and Summary of Significant Accounting Policies (Details Textual) $ in Thousands		3 Months Ended
		Oct. 31, 2015 USD ($) Derivative Segment	Oct. 31, 2014 USD ($)	Jul. 31, 2015 USD ($)
Description Of Business and Summary Of Significant Accounting Policies [Line Items]
Tax benefits realized upon ultimate settlement, Description		The second step is to measure the tax benefit as the largest amount that is more than 50% likely to be realized upon ultimate settlement.
Marketable securities, amortized cost basis		$ 21,100
Marketable equity securities		21,893		$ 0
Unrealized gain on available-for-sale securities, net	[1]	495	$ 0
Capitalized software costs		66,300		65,100
Accumulated amortization expense		$ 43,700		$ 42,600
Number of operating segments | Segment		2
Number of reportable segment | Segment		1
Interest Rate Swap
Description Of Business and Summary Of Significant Accounting Policies [Line Items]
Number of interest rate derivatives held | Derivative		2

[1] Net of tax effect of $279 for the three months ended October 31, 2015.