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Reconciliation of Shares Used to Calculate Basic and Diluted Net Income Per Share (Detail) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Jan. 02, 2015 | Oct. 03, 2014 | Jul. 04, 2014 | Apr. 04, 2014 | Jan. 03, 2014 | Sep. 27, 2013 | Jun. 28, 2013 | Mar. 29, 2013 | Jan. 02, 2015 | Jan. 03, 2014 | Dec. 28, 2012
Schedule Of Earnings Per Share Basic and Diluted [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares used in basic per share computation | 13,293 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 13,469 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 13,520 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 13,537 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 13,556 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 13,598 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 13,637 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 13,667 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 13,455 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 13,616 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 13,780 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Shares used in diluted per share computation | 13,659 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 13,824 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 13,873 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 13,940 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 13,949 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 13,993 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 14,007 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 14,125 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 13,833 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 14,025 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 14,293 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Employee Stock Option |  |  |  |  |  |  |  |  |  |  |
Schedule Of Earnings Per Share Basic and Diluted [Line Items] |  |  |  |  |  |  |  |  |  |  |
Effect of dilutive stock outstanding |  |  |  |  |  |  |  |  | 68 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 82 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 150 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |  |  |
Schedule Of Earnings Per Share Basic and Diluted [Line Items] |  |  |  |  |  |  |  |  |  |  |
Effect of dilutive stock outstanding |  |  |  |  |  |  |  |  | 310 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember | 327 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember | 363 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember

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