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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Compensating Balances and Other Investments Lender Holdbacks (Details) - USD ($) $ in Thousands | 12 Months Ended
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Apr. 30, 2017 | Apr. 30, 2016 | Apr. 30, 2015
COMPENSATING BALANCES AND OTHER INVESTMENTS LENDER HOLDBACKS [Abstract] |  |  |
Decrease in lender holdbacks | $ 2,665 | $ 4,347 | $ 10,738
Increase in lender holdbacks for improvements | $ 903 | $ 1,136 | $ 1,204

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- Definition The cash inflow associated with the decrease in lender hold backs for improvements. + References No definition available. + Details
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- Definition The cash outflow associated with the increase in lender hold backs for improvements. + References No definition available. + Details
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