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Statements of Changes in Stockholders' Equity (Parenthetical) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2016 | Sep. 30, 2015
Statement of Stockholders' Equity [Abstract] |  |
Repurchase of common stock costs | $ 55,655 | $ 55,655

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- Definition Repurchase of common stock cost. + References No definition available. + Details
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Namespace Prefix: | hnna_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration