Goodwill - Additional Information (Details) - USD ($)	Jun. 30, 2018	Mar. 31, 2019	Mar. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract]
Impairment of goodwill	$ 0
Goodwill		$ 218,771,000	$ 218,875,000

Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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-Name Accounting Standards Codification
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