Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
Jun. 30, 2018	Jun. 30, 2017
ASU 2016-18
Accounting Policies [Line Items]
Net cash provided by operating activities	$ 5,147	$ 999

Increase in net cash provided by operating activities.

No definition available.

Name:	qsii_IncreaseInNetCashProvidedByOperatingActivities
Namespace Prefix:	qsii_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration