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Contingencies - Additional Information (Details) $ in Millions | 3 Months Ended |
--- | --- | ---
Aug. 31, 2017 USD ($) Case | May 31, 2017 USD ($)
Loss Contingencies [Line Items] |  |
Number of claims settled by the court | Case | 20 |
California Case [Member] | Pending Litigation [Member] | Expected Litigation Loss [Member] |  |
Loss Contingencies [Line Items] |  |
Litigation Settlement Amount | $ 228.0 |
U.S. Customs and Border Protection ("CBP") [Member] | Expected Litigation Loss [Member] |  |
Loss Contingencies [Line Items] |  |
Loss contingency amount |  | $ 39.3
Payments for legal settlements | 46.5 |
Litigation settlement expense | $ 7.2 |

X
- Definition Amount awarded to other party in judgment or settlement of litigation. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of litigation expense, including but not limited to legal, forensic, accounting, and investigative fees. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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Period Type: | duration

X
- 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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X
- Definition Amount of loss contingency liability expected to be resolved within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349 + Details
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X
- Definition Number of claims settled. + References No definition available. + Details
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X
- Definition The amount of cash paid for the settlement of litigation or for other legal issues during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585 + Details
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Period Type: | duration

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

X
- Details
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X
- Details
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Period Type: |