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Geographic And Service Group Information (Long-Lived Assets Attributable To Geographic Area) (Details) (USD $) In Thousands, unless otherwise specified | Jan. 02, 2015 | Dec. 27, 2013 | Dec. 28, 2012
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Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Total long-lived assets | $ 95,730 us-gaap_NoncurrentAssets | $ 90,341 us-gaap_NoncurrentAssets | $ 90,677 us-gaap_NoncurrentAssets
North America [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Total long-lived assets | 80,152 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | 74,095 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | 74,407 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember
International Primarily European Countries [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Total long-lived assets | $ 15,578 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = hckt_InternationalPrimarilyEuropeanCountriesMember | $ 16,246 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = hckt_InternationalPrimarilyEuropeanCountriesMember | $ 16,270 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = hckt_InternationalPrimarilyEuropeanCountriesMember

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- Definition Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9038-108599 + Details
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