Stock-Based Compensation (Included in Consolidated Statements of Operations) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Document Period End Date			Jun. 30, 2020
Stock based compensation	$ 33,135	$ 30,181	$ 98,030	$ 84,476
Cost of hosting and professional services
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock based compensation	6,205	6,958	18,250	18,646
Cost of product and licensing
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock based compensation	124	197	383	593
Cost of maintenance and support
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock based compensation	360	583	1,206	730
Research and development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock based compensation	8,720	5,662	26,106	15,568
Sales and marketing
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock based compensation	8,003	6,775	23,022	21,643
General and administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock based compensation	$ 9,723	$ 10,006	$ 29,063	$ 27,296