Revenue - Schedule of Subscription and Transaction Fees Disaggregated by Customer Category (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2023
Disaggregation Of Revenue [Line Items]
Total revenue	$ 1,462,570	$ 1,290,172	$ 1,058,468
Subscription and transaction fees
Disaggregation Of Revenue [Line Items]
Total revenue	1,300,804	1,122,733	944,710
Integrated platform
Disaggregation Of Revenue [Line Items]
Total revenue	1,222,798	1,052,717	858,776
BILL AP/AR
Disaggregation Of Revenue [Line Items]
Total revenue	667,782	595,408	505,644
BILL Spend and Expense
Disaggregation Of Revenue [Line Items]
Total revenue	555,016	457,309	353,132
Embedded and Other Solutions
Disaggregation Of Revenue [Line Items]
Total revenue	78,006	70,016	85,934
Interest on funds held for customers
Disaggregation Of Revenue [Line Items]
Total revenue	$ 161,766	$ 167,439	$ 113,758