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Commitments and Contingencies (Narrative) (Details) - USD ($) $ in Millions | 1 Months Ended | 2 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2016 | Jul. 31, 2016 | May 31, 2016 | May 31, 2015 | May 31, 2014
Other Commitments [Line Items] |  |  |  |  |
Rent expense |  |  | $ 39.8 | $ 39.4 | $ 39.1
Minimum future payment obligations under purchase orders and legally binding contractual arrangements |  |  | 109.6 |  |
Commitments to purchase capital assets |  |  | 6.8 |  |
Line of Credit [Member] |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |
Amounts outstanding |  |  | 0.0 |  |
Revolving Credit Facility [Member] |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |
Amounts outstanding |  |  | $ 0.0 |  |
Initiation date |  |  | Aug. 05, 2015 |  |
Expiration term |  |  | 5 years |  |
Expiration date |  |  | Aug. 05, 2020 |  |
Maximum borrowing capacity |  |  | $ 1,000.0 |  |
Number of days borrowed |  |  | 5 days | 2 days |
Standby Letters of Credit [Member] |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |
Maximum borrowing capacity |  |  | $ 43.0 | $ 43.0 |
Amounts outstanding |  |  | $ 0.0 |  |
Minimum [Member] | Standby Letters of Credit [Member] |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |
Expiration date |  |  | Apr. 01, 2017 |  |
Maximum [Member] | Standby Letters of Credit [Member] |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |
Expiration date |  |  | Jul. 01, 2017 |  |
Terminated Agreement [Member] | Revolving Credit Facility [Member] |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |
Expiration date |  |  | Jun. 21, 2018 |  |
Maximum borrowing capacity |  |  | $ 750.0 |  |
Subsequent Event [Member] | Revolving Credit Facility [Member] |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |
Borrowings | $ 100.0 |  |  |  |
Number of days borrowed | 1 day |  |  |  |
PNC Bank, National Association [Member] | Line of Credit [Member] |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |
Expiration date |  |  | Feb. 27, 2017 |  |
PNC Bank, National Association [Member] | Revolving Credit Facility [Member] |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |
Amounts outstanding |  |  | $ 0.0 |  |
Expiration term |  |  | 3 years |  |
Expiration date |  |  | Mar. 17, 2019 |  |
Maximum borrowing capacity |  |  | $ 150.0 |  |
PNC Bank, National Association [Member] | Subsequent Event [Member] | Revolving Credit Facility [Member] |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |
Borrowings |  | $ 56.0 |  |  |

X
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- Definition Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments. + References No definition available. + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 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 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 + Details
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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Date the credit facility first became available, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 + Details
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- Definition The cash inflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with either short term or long term maturity that is uncollateralized (where debt is not backed by the pledge of collateral). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3255-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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