New Accounting Pronouncements - Additional Information (Detail)	9 Months Ended
Jun. 30, 2014
Regulatory Assets [Abstract]
Percentage of likelihood of indefinite intangible assets	50.00%

Minimum percentage of likelihood of indefinite lived intangible assets being impaired.

No definition available.

Name:	hnna_MinimumPercentageOfLikelihoodOfIndefiniteLivedIntangibleAssetsBeingImpaired
Namespace Prefix:	hnna_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration