Discontinued Operations - Carrying Amount of Assets Held for Sale in Consolidated Balance Sheet (Details) - USD ($) |
12 Months Ended | ||
|---|---|---|---|
Apr. 30, 2017 |
Apr. 30, 2016 |
Apr. 30, 2015 |
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| Discontinued Operations and Disposal Groups [Abstract] | |||
| Loss on disposal of discontinued operations, net of tax | $ 0 | $ 0 | $ (1,537,000) |
| Assets held for sale | $ 0 | ||
| X | ||||||||||
- Definition Amount classified as assets attributable to disposal group held for sale or disposed of, expected to be disposed of within one year or the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount after tax of gain (loss) not previously recognized resulting from the disposal of a discontinued operation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- References No definition available.
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