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RETIREMENT PLANS (Details) - USD ($) $ in Thousands | 12 Months Ended
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Apr. 30, 2018 | Apr. 30, 2017 | Apr. 30, 2016
Retirement Benefits [Abstract] |  |  |
Maximum contribution each employee, towards 401(k) plan | 5.00% |  |
Employer contribution towards profit sharing plan and 401(k) plan | $ 838 | $ 565 | $ 836
Maximum contribution each employee, towards 401(k) plan, increase | 1.00% |  |
Discretionary employer contribution |  |  | 3.50%

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- Definition Percentage of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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- Definition Defined Contribution Plan, Maximum Annual Contributions Per Employee, Increase (Decrease), Percent + References No definition available. + Details
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Balance Type: | na
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- References No definition available. + Details
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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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