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Sale of Theatre Rigging Manufacturing (Details) - Theatre Rigging Manufacturing [Member] - USD ($) $ in Thousands | 12 Months Ended |
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Apr. 30, 2016 | Jul. 31, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Gain from sale of division | $ 1,261 |
Assets sold |  | $ 2,817
Accounts payable sold |  | $ 355

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