CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	9 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash Flows from Operating Activities:
Net loss	$ (160.7)	$ (148.2)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization expense	28.2	15.0
Stock-based compensation expense	56.3	76.0
Non-cash operating lease expense	33.5	0.0
Other non-cash items	(4.1)	(0.3)
Changes in operating assets and liabilities:
Accounts receivable	(5.4)	(13.8)
Inventories	(46.2)	(86.5)
Prepaid expenses and other current assets	(24.3)	(14.9)
Other assets	(18.2)	(6.6)
Accounts payable and accrued expenses	64.0	80.7
Customer deposits and deferred revenue	124.0	13.1
Operating lease liabilities, net	(20.7)	0.0
Other liabilities	14.5	9.3
Net cash provided by (used in) operating activities	49.1	(75.6)
Cash Flows from Investing Activities:
Purchases of marketable securities	(1,199.6)	(204.0)
Maturities of marketable securities	331.5	0.0
Sales of marketable securities	118.0	0.0
Cash paid for cost method investment	(0.1)	(0.6)
Acquisition of business, net of cash acquired	(45.6)	(0.1)
Purchases of property and equipment	(110.1)	(47.9)
Net cash used in investing activities	(905.9)	(252.6)
Cash Flows from Financing Activities:
Proceeds from issuance of common stock upon initial public offering, net of offering costs	1,195.7	0.0
Repurchase of common and convertible preferred stock, including issuance costs	0.0	(130.3)
Proceeds from issuance of redeemable convertible preferred stock, net of issuance costs	0.0	539.1
Proceeds from employee stock purchase plan withholdings	4.6	0.0
Proceeds from exercise of stock options	9.0	3.0
Net cash provided by financing activities	1,209.3	411.8
Effect of exchange rate changes	(5.0)	1.0
Net change in cash, cash equivalents, and restricted cash	347.5	84.6
Cash, cash equivalents and restricted cash — Beginning of period	163.0	151.6
Cash, cash equivalents and restricted cash — End of period	510.5	236.2
Supplemental Disclosures of Cash Flow Information:
Cash paid for interest	0.0	0.7
Cash paid for income taxes	1.0	0.0
Supplemental Disclosures of Non-Cash Investing and Financing Information:
Conversion of convertible preferred stock to common stock	(941.1)	0.0
Property and equipment accrued but unpaid	21.2	7.9
Building - build-to-suit asset	0.0	130.0
Stock-based compensation capitalized for software development costs	$ 1.5	$ 0.3