CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands		12 Months Ended
		Jun. 30, 2020	Jun. 30, 2019		Jun. 30, 2018
Cash flows from operating activities:
Net loss		$ (31,091)	$ (7,314)	[1]	$ (7,195)	[1]
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization		4,257	3,154	[1]	2,314	[1]
Stock-based compensation		18,064	4,082	[1]	1,545	[1]
Accretion of discount on investments in marketable debt securities		(3,815)	(1,319)	[1]
Revaluation of warrant liabilities and forfeiture of warrants		717	25	[1]	182	[1]
Issuance of warrants	[1]		274
Deferred income taxes	[1]		(176)
Changes in assets and liabilities:
Accounts receivable		(1,054)	(2,098)	[1]	(279)	[1]
Unbilled revenue		(554)	(1,748)	[1]	(503)	[1]
Prepaid expenses and other current assets		(10,434)	(5,690)	[1]	(3,477)	[1]
Other assets		(4,928)	(995)	[1]	(2,828)	[1]
Accounts payable		(1,596)	3,171	[1]	(563)	[1]
Accrued and other current liabilities		9,755	4,336	[1]	1,642	[1]
Other long-term liabilities		12,991	302	[1]	35	[1]
Deferred revenue		3,258	47	[1]	771	[1]
Net cash used in operating activities		(4,430)	(3,949)	[1]	(8,356)	[1]
Cash flows from investing activities:
Purchases of corporate and customer fund short-term investments		(1,088,611)	(830,622)	[1]	(726,788)	[1]
Proceeds from maturities of corporate and customer fund short-term investments		806,000	694,303	[1]	290,828	[1]
Proceeds from sale of corporate and customer fund short-term investments		46,159	54,715	[1]	16,498	[1]
(Increase) decrease in other receivables included in funds held for customers		(959)	(10,203)	[1]	3,686	[1]
Purchases of property and equipment		(11,437)	(2,743)	[1]	(1,313)	[1]
Capitalization of internal-use software costs		(639)	(1,556)	[1]	(733)	[1]
Net cash used in investing activities		(249,487)	(96,106)	[1]	(417,822)	[1]
Cash flows from financing activities:
Proceeds from issuance of common stock upon initial public offering, net of underwriting discounts and commissions and other offering costs		225,481
Proceeds from issuance of common stock upon follow-on public offering, net of underwriting discounts and commissions and other offering costs		308,176
Proceeds from issuance of redeemable convertible preferred stock, net of issuance costs	[1]		85,160		55,805
Increase in customer fund deposits liability		314,944	414,293	[1]	263,671	[1]
Proceeds from line of credit and bank borrowings		2,300			9,500	[1]
Payments on bank borrowings	[1]		(9,500)		(3,387)
Proceeds from exercise of stock options		12,232	1,702	[1]	693	[1]
Proceeds from exercise of stock warrants		144
Payments of deferred debt issuance costs		(151)
Net cash provided by financing activities		863,126	491,655	[1]	326,282	[1]
Net increase (decrease) in cash, cash equivalents, restricted cash, and restricted cash equivalents		609,209	391,600	[1]	(99,896)	[1]
Cash, cash equivalents, restricted cash, and restricted cash equivalents, beginning of year	[1]	983,168	591,568		691,464
Cash, cash equivalents, restricted cash, and restricted cash equivalents, end of year		1,592,377	983,168	[1]	591,568	[1]
Supplemental disclosure of cash flow information:
Cash paid for interest		174	872	[1]	436	[1]
Noncash investing and financing activities:
Payable on purchases of property and equipment	[1]				1,908
Conversion of redeemable convertible preferred stock into common stock upon initial public offering		276,307
Reclassification of redeemable convertible preferred stock warrant liabilities into additional paid-in capital upon initial public offering		1,405
Receivable from broker-assisted exercises of stock options		1,228
Accrued offering and debt issuance costs		664	470	[1]
Reconciliation of cash, cash equivalents, restricted cash, and restricted cash equivalents within the consolidated balance sheets to the amounts shown in the consolidated statements of cash flows above:
Cash and cash equivalents		573,643	90,306	[1]	22,401	[1]
Restricted cash included in other current assets		$ 35	$ 256	[1]	$ 256	[1]
Restricted Cash, Current, Asset, Statement of Financial Position [Extensible List]		us-gaap:OtherAssetsCurrent	us-gaap:OtherAssetsCurrent	[1]	us-gaap:OtherAssetsCurrent	[1]
Restricted cash included in other assets	[1]		$ 550
Restricted Cash, Noncurrent, Asset, Statement of Financial Position [Extensible List]		us-gaap:OtherAssetsNoncurrent	us-gaap:OtherAssetsNoncurrent	[1]	us-gaap:OtherAssetsNoncurrent	[1]
Restricted cash and restricted cash equivalents included in funds held for customers		$ 1,018,699	$ 892,056	[1]	$ 568,911	[1]
Cash, cash equivalents, restricted cash, and restricted cash equivalents, end of year		$ 1,592,377	$ 983,168	[1]	$ 591,568	[1]

[1] Amounts have been adjusted to reflect the adoption of Accounting Standards Update No. 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash. See Note 1 to the consolidated financial statements for a summary of reclassifications and adjustments.