Joint Venture - Additional Information (Details) - USD ($)		3 Months Ended		6 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Jan. 31, 2019
Schedule Of Equity Method Investments [Line Items]
Gain on contribution to joint venture				$ 12,964,000	$ 0
Total net revenue	[1]	$ 98,826,000	$ 102,318,000	188,403,000	198,147,000
CNNC Accuray (Tianjin) Medical Technology Co. Ltd
Schedule Of Equity Method Investments [Line Items]
Total net revenue		2,643,000	$ 0	6,460,000	$ 0
Accounts receivable from Joint Venture		0		$ 0
Accuray Asia
Schedule Of Equity Method Investments [Line Items]
Percentage of ownership interest in joint venture						49.00%
Gain on contribution to joint venture		$ 13,000,000.0
Proportion of recognizing joint venture income or loss				49.00%
CIRC Subsidiary
Schedule Of Equity Method Investments [Line Items]
Percentage of ownership interest in joint venture						51.00%

[1] Includes sales to the China joint venture, an equity method investment of $2,643 and $6,460 for the three and six months ended December 31, 2019 and $0 for both the three and six months ended December 31, 2018, respectively. See Note 14.