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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) (Parenthetical) - USD ($) $ in Thousands | 3 Months Ended
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Jul. 31, 2017 | Jul. 31, 2016
CASH FLOWS FROM FINANCING ACTIVITIES |  |
Cash paid for interest | $ 0 | $ 153

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- Definition The amount of cash paid during the current period for interest that is capitalized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3213-108585 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration