Joint Venture - Additional Information (Details) - USD ($)		1 Months Ended	3 Months Ended
		Jan. 31, 2019	Sep. 30, 2019	Sep. 30, 2018	Jun. 30, 2019
Schedule Of Equity Method Investments [Line Items]
Total net revenue	[1]		$ 89,577,000	$ 95,829,000
Accounts receivable from Joint Venture			3,438,000		$ 0
Accuray Asia
Schedule Of Equity Method Investments [Line Items]
Percentage of ownership interest in joint venture		49.00%
Capital contributions to joint ventures		$ 0
CIRC Subsidiary
Schedule Of Equity Method Investments [Line Items]
Percentage of ownership interest in joint venture		51.00%
Accounts receivable from Joint Venture			2,800,000
CIRC Subsidiary | Cyber Knife System
Schedule Of Equity Method Investments [Line Items]
Total net revenue			$ 2,800,000

[1] Includes sales to joint venture of $3,817 and $0 for the three months ended September 30, 2019 and 2018, respectively. See Note 14.