Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
Dec. 31, 2020	Dec. 28, 2019
Disaggregation Of Revenue [Line Items]
Revenue	$ 429,050	$ 356,110
Recurring revenue
Disaggregation Of Revenue [Line Items]
Revenue	384,957	305,368
Perpetual license
Disaggregation Of Revenue [Line Items]
Revenue	8,463	8,998
Professional services
Disaggregation Of Revenue [Line Items]
Revenue	$ 35,630	$ 41,744

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.

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+ Details