Joint Venture - Additional Information (Details)	9 Months Ended
	Mar. 31, 2019	Jan. 31, 2019
Accuray Asia
Schedule Of Equity Method Investments [Line Items]
Percentage of ownership interest in joint venture		49.00%
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%