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Description of Business and Significant Accounting Policies (Narrative) (Details) | 3 Months Ended
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Mar. 31, 2018
Basis Of Presentation Fiscal Year End And New Accounting Pronouncements Disclosure [Abstract] |
Operating Cycle | The fiscal year of the Company consists of a 52- or 53-week period ending on the Saturday closest to December 31. Fiscal year 2018 is a 52-week period ending on December 29, 2018, with quarterly periods ending on March 31, June 30 and September 29, 2018. Fiscal year 2017 was a 52-week period ending on December 30, 2017, with quarterly periods ending on April 1, July 1 and September 30, 2017.
Year Founded | 1973

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- Definition Entity's operating cycle if it is other than 12 months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 926 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6473108&loc=d3e54406-107959 + Details
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