COMMITMENTS AND CONTINGENT LIABILITIES - Contingencies (Details)	7 Months Ended
Aug. 31, 2015 lawsuit	May 31, 2015 clinic
COMMITMENTS AND CONTINGENT LIABILITIES
Number of law suits filed \| lawsuit	2
Number of clinics that received investigative demand for record \| clinic		1

Number of clinic that received investigative demand for records.

No definition available.

Name:	hgr_NumberOfClinicInvestigated
Namespace Prefix:	hgr_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant