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Goodwill and Intangible Assets - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
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May. 31, 2015 | May. 31, 2014 | May. 31, 2013
Goodwill [Line Items] |  |  |
Amortization expense of acquired intangibles | $ 72,587 | $ 61,945 | $ 56,765
Customer-related intangible assets |  |  |
Goodwill [Line Items] |  |  |
Intangible assets weighted average amortization periods | 15 years 1 month 6 days | 13 years 2 months 24 days |
Contract-based intangible assets |  |  |
Goodwill [Line Items] |  |  |
Intangible assets weighted average amortization periods |  | 13 years 2 months 18 days |
Technology-based intangible assets |  |  |
Goodwill [Line Items] |  |  |
Intangible assets weighted average amortization periods | 9 years 1 month 6 days | 6 years 6 months |
Trademarks and Trade Names |  |  |
Goodwill [Line Items] |  |  |
Intangible assets weighted average amortization periods | 6 years 1 month 6 days |  |

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 + Details
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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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