Revenue - Schedule of Remaining Performance Obligations related to Warranty (Details) - Long-term warranty and service $ in Thousands	Sep. 30, 2018 USD ($)
2019	$ 22,411
2020	21,862
2021	12,939
Thereafter	$ 9,255

Amount of transaction price allocated to performance obligation that has not been recognized as revenue in Year Three and Thereafter

No definition available.

Name:	aray_RevenueRemainingPerformanceObligationInYearThreeAndThereafter
Namespace Prefix:	aray_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant