Restructuring (Details) - USD ($) $ in Thousands	12 Months Ended
Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2023
Restructuring and Related Activities [Abstract]
Restructuring expense	$ 0	$ 27,587	$ 0
Restructuring expenses, stock-based compensation expense		$ 3,600

Restructuring Charges And Other Share Based Compensation Expense

No definition available.

Name:	bill_RestructuringChargesAndOtherShareBasedCompensationExpense
Namespace Prefix:	bill_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration