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Summary of Significant Accounting Policies - Property and Equipment (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
May. 31, 2015 USD ($) market | May. 31, 2014 USD ($)
Property, Plant and Equipment [Line Items] |  |
Property and equipment, gross | $ 554,075 | $ 541,718
Authorization platform number of markets | market | 9 |
Authorization Platform Hardware and Software |  |
Property, Plant and Equipment [Line Items] |  |
Property and equipment, gross | $ 101,000 |

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- Definition Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 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 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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