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Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Disaggregation Of Revenue [Line Items]
Revenue	$ 1,807,159	$ 1,458,415	$ 1,255,631
Total recurring revenue
Disaggregation Of Revenue [Line Items]
Revenue	1,616,328	1,281,949	1,017,398
Perpetual license
Disaggregation Of Revenue [Line Items]
Revenue	33,013	32,668	70,702
Professional services
Disaggregation Of Revenue [Line Items]
Revenue	$ 157,818	$ 143,798	$ 167,531

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

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