Description of Business and Summary of Significant Accounting Policies (Details Textual) $ in Thousands	12 Months Ended
	Jul. 31, 2019 USD ($) Segment Customer	Jul. 31, 2018 USD ($) Segment Customer	Jul. 31, 2017 USD ($) Customer	Aug. 01, 2019 USD ($)
Description of Business and Summary of Significant Accounting Policies (Textual)
Number of reportable segments | Segment	2	2
Investments accounted for using the equity method	$ 5,400	$ 4,700
Investments accounted for using the cost method		1,900
Restricted cash and cash equivalents	13,400	10,700
Advertising expense	17,700	16,300	$ 17,400
Amortization expense related to capitalized software	16,300	16,100	$ 14,200
Unamortized capitalized internal use software costs	$ 21,900	$ 24,900
Tax position ultimate settlement, percentage	50.00%
Concentration risk, description	No single customer accounted for more than 10% of consolidated revenues.
Operating lease liability				$ 12,400
Customer Lists [Member] | Sales Revenue, Net [Member]
Description of Business and Summary of Significant Accounting Policies (Textual)
Number of customers | Customer	5	5	5
Concentration risk, percentage	13.60%	12.50%	12.40%
Customer Lists [Member] | Accounts Receivable [Member]
Description of Business and Summary of Significant Accounting Policies (Textual)
Number of customers | Customer	5	5
Concentration risk, percentage	20.60%	18.70%
Equipment [Member]
Description of Business and Summary of Significant Accounting Policies (Textual)
Estimated useful lives of long-lived assets	7 years
Computer Software [Member]
Description of Business and Summary of Significant Accounting Policies (Textual)
Estimated useful lives of long-lived assets	3 years
Furniture and Fixtures [Member]
Description of Business and Summary of Significant Accounting Policies (Textual)
Estimated useful lives of long-lived assets	7 years
Software and Software Development Costs [Member]
Description of Business and Summary of Significant Accounting Policies (Textual)
Estimated useful lives of internal-use software	Capitalizes the cost of internal-use software that has a useful life in excess of one year.
Minimum [Member] | Equipment [Member]
Description of Business and Summary of Significant Accounting Policies (Textual)
Estimated useful lives of long-lived assets	5 years
Minimum [Member] | Computer Software [Member]
Description of Business and Summary of Significant Accounting Policies (Textual)
Estimated useful lives of long-lived assets	2 years
Minimum [Member] | Furniture and Fixtures [Member]
Description of Business and Summary of Significant Accounting Policies (Textual)
Estimated useful lives of long-lived assets	5 years
Maximum [Member] | Equipment [Member]
Description of Business and Summary of Significant Accounting Policies (Textual)
Estimated useful lives of long-lived assets	20 years
Maximum [Member] | Computer Software [Member]
Description of Business and Summary of Significant Accounting Policies (Textual)
Estimated useful lives of long-lived assets	5 years
Maximum [Member] | Furniture and Fixtures [Member]
Description of Business and Summary of Significant Accounting Policies (Textual)
Estimated useful lives of long-lived assets	10 years