v3.5.0.1

Discontinued Operations - Carrying Amount of Assets Held for Sale in Consolidated Balance Sheet (Details) - USD ($) | 12 Months Ended
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Apr. 30, 2016 | Apr. 30, 2015 | Apr. 30, 2014
Discontinued Operations and Disposal Groups [Abstract] |  |  |
Total assets of discontinued operations |  |  | $ 42,937,000
Loss on disposal of discontinued operations, net of tax | $ 0 | $ (1,537,000) | (9,192,000)
Assets held for sale | $ 0 |  | $ 33,745,000

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