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Income taxes (Details) - USD ($) | 3 Months Ended
--- | ---
Mar. 25, 2016 | Mar. 27, 2015
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |
Unrecognized tax benefits | $ 0 | $ 0

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

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- Definition Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | credit
Period Type: | duration