Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Thousands	9 Months Ended
Dec. 31, 2018	Dec. 31, 2017
ASU 2016-18
Accounting Policies [Line Items]
Net cash provided by operating activities	$ 5,016	$ (1,523)

Increase (decrease) in net cash provided by operating activities.

No definition available.

Name:	nxgn_IncreaseDecreaseInNetCashProvidedByOperatingActivities
Namespace Prefix:	nxgn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration