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Condensed consolidating financial information - Narrative (Details) | Oct. 28, 2017
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Parent's ownership in guarantor subsidiary (percent) | 100.00%

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- Definition The parent entity's interest in net assets of the subsidiary, expressed as a percentage. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
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