Joint Venture - Additional Information (Details) - USD ($)	12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2020	Jan. 31, 2019
Schedule Of Equity Method Investments [Line Items]
Gain on contribution to joint venture	$ 0	$ 0	$ 12,964,000
Increase to accumulated deficit	(492,522,000)	(488,024,000)
Currency translation adjustment	(120,000)	243,000
Proportional share of underlying equity in net assets, difference amount	1,700,000
Goodwill	57,840,000	57,960,000	57,717,000
Impairment of goodwill	$ 0	$ 0	$ 0
Accuray Asia
Schedule Of Equity Method Investments [Line Items]
Percentage of ownership interest in joint venture	49.00%			49.00%
Percentage of ownership interest in joint venture		49.00%
Increase to accumulated deficit	$ 1,000,000.0
Deferred of intra-entity profit margin	4,700,000	$ 2,100,000
Previously deferred intra-entity margin from system sales	1,400,000	1,800,000
Deferral of intra entity margin from system sales	4,700,000	$ 2,100,000
Equity method investment	13,900,000
Proportional share of underlying equity in net assets	14,600,000
Currency translation adjustment	1,000,000.0
Elimination of equity method investment intra-entity profit on sales	5,400,000
Goodwill	4,700,000
Impairment of goodwill	$ 0