Revenue - Schedule of Revenue from Subscription and Transaction Fees Disaggregated by Customer Category (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Disaggregation Of Revenue [Line Items]
Total revenue	$ 358,217	$ 323,028	$ 1,079,221	$ 946,508
Subscription and transaction fees
Disaggregation Of Revenue [Line Items]
Total revenue	320,298	281,294	954,857	821,428
Integrated platform
Disaggregation Of Revenue [Line Items]
Total revenue	301,683	263,383	897,271	771,457
BILL AP/AR
Disaggregation Of Revenue [Line Items]
Total revenue	163,775	149,091	492,905	440,534
BILL Spend and Expense
Disaggregation Of Revenue [Line Items]
Total revenue	137,908	114,292	404,366	330,923
Embedded and Other Solutions
Disaggregation Of Revenue [Line Items]
Total revenue	18,615	17,911	57,586	49,971
Interest on funds held for customers
Disaggregation Of Revenue [Line Items]
Total revenue	$ 37,919	$ 41,734	$ 124,364	$ 125,080