Subsequent Events - Additional Information (Details) - Subsequent Event	Jan. 28, 2019
Accuray Asia
Subsequent Event [Line Items]
Percentage of ownership interest in joint venture	49.00%
CIRC Subsidiary
Subsequent Event [Line Items]
Percentage of ownership interest in joint venture	51.00%

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

No definition available.

Name:	us-gaap_SubsequentEventLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration