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Long-Term Debt, Derivatives and Letters of Credit - Additional Information (Detail) € in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Aug. 31, 2015 USD ($) | Aug. 31, 2015 EUR (€) | May. 31, 2015 USD ($)
Standby Letters of Credit [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Outstanding letter of credit | $ 13,300,000 |  | $ 12,100,000
New Credit Facility [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Borrowing capacity | $ 500,000,000 |  |
Maturity period | 2020-07 |  |
Credit Facility, Covenant Terms | The New Credit Facility also contains financial covenants requiring the Company to maintain as of the end of each fiscal quarter (i) a maximum ratio of consolidated funded debt to consolidated EBITDA of not more than 4.00 to 1.00(until August 31, 2016, at which point the ratio decrease by 0.25 to 1.00 every other quarter until it reaches 3.00 to 1.00), (ii) a maximum ratio of senior secured debt to consolidated EBITDA of not more than 3.00 to 1.00 and (iii) an interest coverage ratio of less than 3.00 to 1.00. |  |
Maximum ratio of consolidated funded debt to consolidated EBITDA | 4.00 | 4.00 |
Decrease in ratio of consolidated funded debt to consolidated EBITDA | 0.25 |  |
Maximum ratio of senior secured debt to consolidated EBITDA | 3.00 | 3.00 |
Minimum interest coverage ratio | 3.00 | 3.00 |
New Credit Facility [Member] | Five-year revolving loan facility [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Borrowing capacity | $ 300,000,000 |  |
New Credit Facility [Member] | Five-year term loan facility [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Borrowing capacity | 200,000,000 |  |
Net Investment Hedge [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Borrowing under credit facility | $ 13,800,000 | € 12.3 |

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + Details
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