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Stock Repurchase Program - Additional Information (Detail) - shares | 3 Months Ended | 6 Months Ended
--- | --- | ---
Nov. 30, 2017 | Nov. 30, 2016 | Nov. 30, 2017 | Nov. 30, 2016
Stock Repurchase Programs [Line Items] |  |  |  |
Authorization of stock repurchase program |  |  | Jan. 08, 2008 |
Shares repurchased | 0 | 0 | 0 | 0
Minimum |  |  |  |
Stock Repurchase Programs [Line Items] |  |  |  |
Shares authorized to be repurchased, per year | 1,000,000 |  | 1,000,000 |
Maximum |  |  |  |
Stock Repurchase Programs [Line Items] |  |  |  |
Shares authorized to be repurchased, per year | 2,000,000 |  | 2,000,000 |

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- Definition Shares repurchased authorization date. + References No definition available. + Details
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- Definition Stock Repurchase Programs [Line Items] + References No definition available. + Details
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- Definition The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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- Definition Number of shares that have been repurchased during the period and are being held in treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 + Details
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