CarParts.com, Inc. Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity and Share-Based Compensation - Common Stock (Detail)

Stockholders' Equity and Share-Based Compensation - Common Stock (Detail) - shares	12 Months Ended
	Jan. 02, 2016	Jan. 03, 2015	Dec. 28, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares authorized	100,000,000	100,000,000
Shares of common stock issued from option exercises	301,185
Series A Convertible Preferred Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of common stock in connection with preferred stock dividends (in shares)	103,000	83,000	24,000
Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares authorized	100,000
Shares of common stock issued from option exercises	301,000	144,000	101,000
Issuance of common stock in connection with preferred stock dividends (in shares)	103,000	107,000	50,000
Common Stock \| Series A Convertible Preferred Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of common stock in connection with preferred stock dividends (in shares)	103,000
Employee Stock Option \| Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock issued from option exercises	162,000
Restricted Stock Units (RSUs) \| Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock issued from option exercises	148,000
Performance Stock Units \| Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock issued from option exercises	99,000
Non-Employee Member Of The Board Of Directors \| Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of common stock in connection with service fees	2,000