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New Accounting Pronouncements - Additional Information (Detail) - USD ($) $ in Millions | Aug. 31, 2015 | May. 31, 2015
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Significant Of Accounting Policies [Line Items] |  |
Deferred debt cost, Current | $ 3.0 | $ 3.0
Deferred debt costs, long term net | $ 10.6 | $ 11.5

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- Definition Net amount of long-term deferred finance costs capitalized at the end of the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28555-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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