Joint Venture - Summary of Financial Information of Joint Ventures (Balance Sheet Data) (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Jun. 30, 2019
Schedule Of Equity Method Investments [Line Items]
Current assets	$ 350,890		$ 352,773
Total assets	472,849		480,098
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current liabilities	208,858		192,359
Stockholder's equity	53,189		68,840		$ 63,635	$ 49,871
Total liabilities and stockholders’ equity	$ 472,849		$ 480,098
CNNC Accuray (Tianjin) Medical Technology Co. Ltd.
Schedule Of Equity Method Investments [Line Items]
Current assets		$ 71,730		$ 24,703
Non current assets		21,754		23,089
Total assets		93,484		47,792
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current liabilities		61,877		16,854
Non current liabilities		1,055		1,467
Stockholder's equity		30,552		29,471
Total liabilities and stockholders’ equity		$ 93,484		$ 47,792