Revenue, Performance Obligations, Deferred Revenue and Unbilled Revenue - Schedule of Revenue from Subscription and Transaction Fees Disaggregated by Customer Category (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020
Disaggregation Of Revenue [Line Items]
Total revenue	$ 156,478	$ 118,349	$ 54,045	$ 274,827	$ 100,254
Subscription and Transaction Fees
Disaggregation Of Revenue [Line Items]
Total revenue	155,519		52,333	273,077	96,121
Subscription and Transaction Fees | Small-to-midsize Business, Accounting Firm Customers and Other
Disaggregation Of Revenue [Line Items]
Total revenue	147,530		49,000	261,132	89,899
Subscription and Transaction Fees | Financial Institution Customers
Disaggregation Of Revenue [Line Items]
Total revenue	7,989		3,333	11,945	6,222
Interest on Funds Held for Customers
Disaggregation Of Revenue [Line Items]
Total revenue	$ 959		$ 1,712	$ 1,750	$ 4,133