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Commitments and Contingencies (Details) (Unfavorable Regulatory Action [Member], USD $) In Millions, unless otherwise specified | Mar. 31, 2014 Assessment
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Raw Materials Assessment [Member] |
Loss Contingencies [Line Items] |
Number of assessments from the tax authorities regarding ICMS taxes | 2
Number of tax assessments related to periods that predated acquisition and are covered by indemnification | 1
Loss Contingency, Range of Possible Loss, Maximum | $ 40
Portion covered by indemnification | 18
Electricity Assessment [Member] |
Loss Contingencies [Line Items] |
Loss Contingency, Range of Possible Loss, Maximum | $ 20

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- Definition The number of assessments from the tax authorities of the State of Rio de Janeiro for unpaid Imposto sobre circulacao de Mercadorias e Servicos (or ICMS) taxes, a form of value-added tax in Brazil. + References No definition available. + Details
Name: | swm_NumberOfAssessmentsFromTaxAuthoritiesRegardingIcmsTaxes
Namespace Prefix: | swm_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Number of the tax assessments by the State of Rio de Janeiro that are for periods prior to the acquisition of Pirahy and are covered, in part, by an indemnification from the sellers. + References No definition available. + Details
Name: | swm_NumberOfTaxAssessmentsRelatedToPeriodsThatPredatedAcquisitionAndAreCoveredByIndemnification
Namespace Prefix: | swm_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition The portion of the estimated loss that is covered by the indemnification of the prior owners as part of the purchase. + References No definition available. + Details
Name: | swm_PortionOfLossCoveredByIndemnification
Namespace Prefix: | swm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_LossContingenciesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The estimated maximum amount of possible loss from the contingency. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349 + Details
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Namespace Prefix: | us-gaap_
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