Stock-Based Compensation - Included in Consolidated Statements of Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock based compensation	$ 141,212	$ 142,909	$ 142,901
Cost of product and licensing
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock based compensation	855	814	348
Professional Services And Hosting
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock based compensation	28,523	31,094	28,532
Maintenance And Support
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock based compensation	1,314	3,322	2,161
Research and development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock based compensation	38,454	38,077	30,540
Selling and Marketing Expense
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock based compensation	34,360	35,838	39,037
General and administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock based compensation	$ 37,706	$ 33,764	$ 42,283