Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Thousands	6 Months Ended
Sep. 30, 2018	Sep. 30, 2017
ASU 2016-18
Accounting Policies [Line Items]
Net cash provided by operating activities	$ 4,958	$ 1,572

Increase in net cash provided by operating activities.

No definition available.

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