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Common Stock (Detail 2) (USD $)	12 Months Ended
	Jan. 03, 2015	Dec. 28, 2013	Dec. 29, 2012	Oct. 23, 2014	Feb. 13, 2014	Aug. 10, 2012
Share Repurchase Program
Share repurchase program, amount authorized to be repurchased				$ 30,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount1	$ 15,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount1	$ 5,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount1
Options exercised (in shares)
Exercise of stock options (in shares)	20,931us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised	13,389us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised	47,185us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Proceeds from exercise of options	500,000us-gaap_ProceedsFromStockOptionsExercised	200,000us-gaap_ProceedsFromStockOptionsExercised	600,000us-gaap_ProceedsFromStockOptionsExercised
Tax Deficit on Stock Option Exercises and Restricted Share Vesting
Tax deficits on stock options exercises and restricted share vestings	$ (128,000)us-gaap_AdjustmentsToAdditionalPaidInCapitalIncomeTaxDeficiencyFromShareBasedCompensation	$ 254,000us-gaap_AdjustmentsToAdditionalPaidInCapitalIncomeTaxDeficiencyFromShareBasedCompensation	$ 576,000us-gaap_AdjustmentsToAdditionalPaidInCapitalIncomeTaxDeficiencyFromShareBasedCompensation

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Amount of decrease in additional paid in capital (APIC) resulting from a tax deficiency associated with a share-based compensation plan other than an employee stock ownership plan (ESOP).

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The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

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Number of share options (or share units) exercised during the current period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



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Amount of stock repurchase plan authorized.

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