Goodwill (Details) - USD ($) |
12 Months Ended | |
|---|---|---|
Apr. 30, 2016 |
Apr. 30, 2015 |
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| Goodwill [Abstract] | ||
| Goodwill | $ 139,155,000 | $ 139,155,000 |
| Goodwill, Acquired During Period | $ 0 |
| X | ||||||||||
- Definition Goodwill [Abstract] No definition available.
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| X | ||||||||||
- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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