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Treasury Stock - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 16 Months Ended |
--- | --- | --- | --- | ---
Nov. 30, 2016 | Nov. 30, 2016 | Nov. 30, 2016 | Jul. 22, 2015
Stockholders' Equity Attributable to Parent [Abstract] |  |  |  |
Increase in authorized amount of stock to be repurchased |  |  |  | $ 50.0
Treasury stock acquired | $ 6.0 | $ 6.0 | $ 10.5 |

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- Definition Stock Repurchase Program, Increase in Authorized Amount + References No definition available. + Details
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- Definition Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the par value method. + 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 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 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=6928386&loc=d3e21463-112644 + Details
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