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v3.3.0.814

Subsequent Event (Details) $ in Millions | Oct. 15, 2015 USD ($)
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Revolving credit facility, due 2020 [Member] |
Subsequent Event [Line Items] |
Line of Credit Facility, Current Borrowing Capacity | $ 300.0
Line of Credit Facility, Additional Borrowing Capacity | 100.0
Line of Credit Facility Capacity Available for Swing-Line Loans | 30.0
Line of Credit Facility Capacity Available for Letters of Credit | 30.0
Revolving credit facility, due 2017 [Member] |
Subsequent Event [Line Items] |
Line of Credit Facility, Current Borrowing Capacity | $ 300.0
Base Rate [Member] |
Subsequent Event [Line Items] |
Basis Point Margin on Variable Rate Minimum | 0
Basis Point Margin on Variable Rate Maximum | 75
London Interbank Offered Rate (LIBOR) [Member] |
Subsequent Event [Line Items] |
Basis Point Margin on Variable Rate Minimum | 100
Basis Point Margin on Variable Rate Maximum | 175

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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any 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
Name: | us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The maximum basis points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
Name: | wst_BasisPointMarginonVariableRateMaximum
Namespace Prefix: | wst_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition The minimum basis points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
Name: | wst_BasisPointMarginonVariableRateMinimum
Namespace Prefix: | wst_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Additional borrowing capacity under the credit facility. + References No definition available. + Details
Name: | wst_LineofCreditFacilityAdditionalBorrowingCapacity
Namespace Prefix: | wst_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The maximum amount of borrowing capacity under a line of credit that is available for standby letters of credit. + References No definition available. + Details
Name: | wst_LineofCreditFacilityCapacityAvailableforLettersofCredit
Namespace Prefix: | wst_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The maximum amount of borrowing capacity under a line of credit that is available for swing-line loans. + References No definition available. + Details
Name: | wst_LineofCreditFacilityCapacityAvailableforSwingLineLoans
Namespace Prefix: | wst_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=wst_Revolvingcreditfacilitydue2020Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=wst_RevolvingCreditFacilityDue2017Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_BaseRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |