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REDEEMABLE NONCONTROLLING INTERESTS (Details) $ in Thousands | 12 Months Ended
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Apr. 30, 2016 USD ($) item | Apr. 30, 2015 USD ($) | Apr. 30, 2014 USD ($)
Redeemable Noncontrolling Interest [Line Items] |  |  |
Balance at beginning of fiscal year | $ 6,368 |  |
Contributions |  | $ 8,909 | $ 3,895
Balance at close of fiscal year | 7,522 | 6,368 |
Southgate - Minot, ND [Member] |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |
Balance at beginning of fiscal year | 6,368 | 6,203 | 5,937
Contributions | 1,120 |  |
Net income | 34 | 165 | 266
Balance at close of fiscal year | $ 7,522 | $ 6,368 | $ 6,203
Number of joint ventures | item | 1 |  |
Agreement period of joint venture | 4 years |  |

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- Definition Amount of Net Income (Loss) attributable to redeemable noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.19) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition Amount of increase in noncontrolling interest from subsidiary issuance of equity interests to noncontrolling interest holders. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4573702-111684 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=51664549&loc=SL4569655-111683 + Details
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- Definition Carrying amount, attributable to parent, of an entity's issued and outstanding stock which is not included within permanent equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. Includes stock with a put option held by an ESOP and stock redeemable by a holder only in the event of a change in control of the issuer. + References No definition available. + Details
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