Dorman Products (DORM) 10-K 25 Feb 14 2013 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information (USD $)	12 Months Ended
	Dec. 28, 2013	Feb. 18, 2014	Jun. 29, 2013
Document And Entity Information [Abstract]	'	'	'
Document Type	'10-K	'	'
Amendment Flag	'false	'	'
Document Period End Date	28-Dec-13	'	'
Document Fiscal Year Focus	'2013	'	'
Document Fiscal Period Focus	'FY	'	'
Trading Symbol	'DORM	'	'
Entity Registrant Name	'Dorman Products, Inc.	'	'
Entity Central Index Key	'0000868780	'	'
Current Fiscal Year End Date	'--12-28	'	'
Entity Well-known Seasoned Issuer	'Yes	'	'
Entity Current Reporting Status	'Yes	'	'
Entity Voluntary Filers	'No	'	'
Entity Filer Category	'Large Accelerated Filer	'	'
Entity Common Stock, Shares Outstanding	'	36,502,600	'
Entity Public Float	'	'	$1,005,064,313

Consolidated_Statements_of_Ope

Consolidated Statements of Operations (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Income Statement [Abstract]	'	'	'
Net sales	$664,466	$570,420	$513,432
Cost of goods sold	403,498	355,211	324,165
Gross profit	260,968	215,209	189,267
Selling, general and administrative expenses	133,029	110,978	101,630
Income from operations	127,939	104,231	87,637
Interest expense, net	189	123	103
Income from continuing operations before income taxes	127,750	104,108	87,534
Provision for income taxes	45,830	37,703	31,332
Income from continuing operations	81,920	66,405	56,202
Income (loss) from discontinued operations	'	4,557	-2,925
Net income	$81,920	$70,962	$53,277
Basic:	'	'	'
Income from continuing operations	$2.25	$1.84	$1.57
Income (loss) from discontinued operations	'	$0.12	($0.08)
Net income	$2.25	$1.96	$1.49
Diluted:	'	'	'
Income from continuing operations	$2.24	$1.82	$1.55
Income (loss) from discontinued operations	'	$0.12	($0.08)
Net income	$2.24	$1.94	$1.47
Weighted Average Shares Outstanding:	'	'	'
Basic	36,347	36,124	35,866
Diluted	36,624	36,494	36,370

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Statement Of Income And Comprehensive Income [Abstract]	'	'	'
Net income	$81,920	$70,962	$53,277
Other comprehensive (loss) income:	'	'	'
Currency translation adjustments	'	-2,810	58
Comprehensive income	$81,920	$68,152	$53,335

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Dec. 28, 2013	Dec. 29, 2012
In Thousands, unless otherwise specified
Current assets:	'	'
Cash and cash equivalents	$60,593	$27,708
Accounts receivable, less allowance for doubtful accounts and customer credits of $65,879 and $56,512	180,777	140,180
Inventories	164,421	145,270
Deferred income taxes	20,798	20,559
Prepaids and other current assets	5,851	2,332
Total current assets	432,440	336,049
Property, plant and equipment, net	64,786	48,758
Goodwill and intangible assets, net	30,089	26,553
Other assets	1,854	1,323
Total	529,169	412,683
Current liabilities:	'	'
Accounts payable	61,255	42,387
Accrued compensation	11,779	9,843
Other accrued liabilities	18,704	11,455
Total current liabilities	91,738	63,685
Other long-term liabilities	5,310	3,447
Deferred income taxes	18,480	12,679
Commitments and contingencies (Note 11)	'	'
Shareholders' equity:	'	'
Common stock, par value $0.01; authorized 50,000,000 shares; issued and outstanding 36,464,958 and 36,477,506 shares in 2013 and 2012, respectively	365	365
Additional paid-in capital	43,119	41,007
Retained earnings	370,157	291,500
Total shareholders' equity	413,641	332,872
Total	$529,169	$412,683

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 28, 2013	Dec. 29, 2012
In Thousands, except Share data, unless otherwise specified
Statement Of Financial Position [Abstract]	'	'
Allowance for doubtful accounts and customer credits	$65,879	$56,512
Common stock, par value	$0.01	$0.01
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	36,464,958	36,477,506
Common stock, shares outstanding	36,464,958	36,477,506

Consolidated_Statements_of_Sha

Consolidated Statements of Shareholders' Equity (USD $)	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Cumulative Translation Adjustments [Member]	Retained Earnings [Member]
In Thousands, except Share data
Beginning Balance at Dec. 25, 2010	$263,153	$358	$34,744	$2,752	$225,299
Beginning Balance, Shares at Dec. 25, 2010	'	35,774,688	'	'	'
Common stock issued under Employee Stock Purchase Plan	28	'	28	'	'
Common stock issued under Employee Stock Purchase Plan, Shares	'	1,984	'	'	'
Shares issued under Incentive Stock Plan	629	3	626	'	'
Shares issued under Incentive Stock Plan, Shares	'	291,318	'	'	'
Compensation expense under Incentive Stock Plan	620	'	620	'	'
Purchase and cancellation of common stock	-1,586	-1	-80	'	-1,505
Purchase and cancellation of common stock, Shares	'	-90,268	'	'	'
Issuance of non-vested stock, net of cancellations	'	2	-2	'	'
Issuance of non-vested stock, net of cancellations, Shares	'	178,800	'	'	'
Other stock related activity	924	'	924	'	'
Net income	53,277	'	'	'	53,277
Currency translation adjustments (net of tax)	58	'	'	58	'
Ending Balance at Dec. 31, 2011	317,103	362	36,860	2,810	277,071
Ending Balance, Shares at Dec. 31, 2011	'	36,156,522	'	'	'
Shares issued under Incentive Stock Plan	1,606	4	1,602	'	'
Shares issued under Incentive Stock Plan, Shares	'	394,861	'	'	'
Compensation expense under Incentive Stock Plan	1,007	'	1,007	'	'
Purchase and cancellation of common stock	-1,943	-1	-97	'	-1,845
Purchase and cancellation of common stock, Shares	-70,208	-70,208	'	'	'
Issuance of non-vested stock, net of cancellations	'	'	'	'	'
Issuance of non-vested stock, net of cancellations, Shares	'	5,000	'	'	'
Other stock related activity	1,663	'	1,635	'	28
Other stock related activity, Shares	'	-8,669	'	'	'
Dividends paid	-54,716	'	'	'	-54,716
Net income	70,962	'	'	'	70,962
Currency translation adjustments (net of tax)	-2,810	'	'	-2,810	'
Ending Balance at Dec. 29, 2012	332,872	365	41,007	'	291,500
Ending Balance, Shares at Dec. 29, 2012	36,477,506	36,477,506	'	'	'
Shares issued under Incentive Stock Plan	551	1	550	'	'
Shares issued under Incentive Stock Plan, Shares	'	93,509	'	'	'
Compensation expense under Incentive Stock Plan	960	'	960	'	'
Purchase and cancellation of common stock	-3,489	-1	-142	'	-3,346
Purchase and cancellation of common stock, Shares	-78,580	-78,580	'	'	'
Issuance of non-vested stock, net of cancellations, Shares	'	-17,626	'	'	'
Other stock related activity	827	'	744	'	83
Other stock related activity, Shares	'	-9,851	'	'	'
Net income	81,920	'	'	'	81,920
Ending Balance at Dec. 28, 2013	$413,641	$365	$43,119	'	$370,157
Ending Balance, Shares at Dec. 28, 2013	36,464,958	36,464,958	'	'	'

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Cash Flows from Operating Activities:	'	'	'
Net income	$81,920	$70,962	$53,277
Adjustments to reconcile net income to cash provided by operating activities:	'	'	'
Depreciation, amortization and accretion	10,159	8,225	7,737
Asset write-downs	'	'	2,583
Provision for doubtful accounts	194	266	318
Provision (benefit) for deferred income tax	267	-2,384	-1,997
Provision for non-cash stock compensation	960	1,007	620
Foreign exchange gain	'	-2,987	'
Changes in assets and liabilities:	'	'	'
Accounts receivable	-40,791	-9,730	-22,962
Inventories	-19,045	-29,405	2,794
Prepaids and other current assets	840	293	-439
Other assets	-376	-144	-406
Accounts payable	17,627	10,738	-2,377
Accrued compensation and other liabilities	9,804	2,070	-1,085
Cash provided by operating activities	61,559	48,911	38,063
Cash Flows from Investing Activities:	'	'	'
Property, plant and equipment additions	-24,666	-18,078	-18,102
Acquisition	-1,897	'	'
Cash used in investing activities	-26,563	-18,078	-18,102
Cash Flows from Financing Activities:	'	'	'
Dividends paid	'	-54,716	'
Proceeds from exercise of stock options	551	1,606	629
Other stock related activity	827	1,663	953
Purchase and cancellation of common stock	-3,489	-1,943	-1,586
Cash used in financing activities	-2,111	-53,390	-4
Effect of exchange rate changes on Cash and Cash Equivalents	'	69	-224
Net Increase (Decrease) in Cash and Cash Equivalents	32,885	-22,488	19,733
Cash and Cash Equivalents, Beginning of Year	27,708	50,196	30,463
Cash and Cash Equivalents, End of Year	60,593	27,708	50,196
Supplemental Cash Flow Information	'	'	'
Cash paid for interest expense	201	219	222
Cash paid for income taxes	$44,291	$35,329	$33,398

Summary_of_Significant_Account

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 28, 2013
Accounting Policies [Abstract]	'
Summary of Significant Accounting Policies	'
	1	Summary of Significant Accounting Policies
	Dorman Products, Inc. (“Dorman”, the “Company”, “we”, “us”, or “our”) is a leading supplier of Original Equipment (“OE”) Dealer “Exclusive” automotive replacement parts, automotive hardware, brake products and household hardware to the Automotive Aftermarket and Mass Merchandise markets. Dorman products are marketed under the OE Solutions™, HELP!®, TECHoice™, AutoGrade™, Conduct-Tite®, FirstStop™, Renew™ HD Solutions™ and Hybrid Drive Batteries brand names.
	We operate on a fifty-two, fifty-three week period ending on the last Saturday of the calendar year. The fiscal years ended December 28, 2013 and December 29, 2012 were fifty-two week periods. The fiscal year ended December 31, 2011 was a fifty-three week period.
	Principles of Consolidation. The Consolidated Financial Statements include our accounts and the accounts of our wholly-owned subsidiaries. All material intercompany accounts and transactions have been eliminated in consolidation.
	Use of Estimates in the Preparation of Financial Statements. The preparation of financial statements in accordance with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.
	Reclassifications. The previously reported Consolidated Financial Statements include an adjustment to present accrued customer rebates which may be settled in cash as an accrued liability. The effect of this reclassification adjustment was a $6.4 million increase to accounts receivable and other accrued liabilities as of December 29, 2012. We believe the adjustment is inconsequential to any previous annual or interim Consolidated Financial Statements. Additionally, certain other amounts in the prior-years Consolidated Financial Statements have been reclassified to conform with current-year presentation.
	Cash and Cash Equivalents. We consider all highly liquid short-term investments with original maturities of three months or less to be cash equivalents.
	Sales of Accounts Receivable. We have entered into several customer sponsored programs administered by unrelated financial institutions that permit us to sell certain accounts receivable at discounted rates to the financial institutions. Transactions under these agreements were accounted for as sales of accounts receivable and were removed from our Consolidated Balance Sheet at the time of the sales transactions. During fiscal 2013, fiscal 2012 and fiscal 2011, we sold $406.4 million, $312.7 million and $208.8 million, respectively, pursuant to these agreements. If receivables had not been sold, $267.8 million and $180.5 million of additional receivables would have been outstanding at December 28, 2013 and December 29, 2012, respectively, based on standard payment terms. Selling, general and administrative expenses include $5.2 million, $4.4 million and $3.5 million in fiscal 2013, fiscal 2012 and fiscal 2011, respectively, of financing costs associated with these accounts receivable sales programs.
	Inventories. Inventories are stated at the lower of cost or market. Cost is determined by the first-in, first-out method. We provide reserves for discontinued and excess inventory based upon historical demand, forecasted usage, estimated customer requirements and product line updates.
	Property and Depreciation. Property, plant and equipment are recorded at cost and depreciated over their estimated useful lives, which range from three to thirty-nine years, using the straight-line method for financial statement reporting purposes and accelerated methods for income tax purposes. The costs of maintenance and repairs are expensed as incurred. Renewals and betterments are capitalized. Gains and losses on disposals are included in operating results.
	Estimated useful lives by major asset category are as follows:
	Buildings and building improvements			10 to 39 years
	Machinery, equipment and tooling			3 to 10 years
	Software and computer equipment			3 to 10 years
	Furniture, fixtures and leasehold improvements			3 to 15 years
	Long-lived assets, including property, plant and equipment, are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset or asset group may not be recoverable. The impairment review is a two-step process. First, recoverability is measured by comparing the carrying amount of an asset to the estimated undiscounted future cash flows expected to be generated by the asset. If the carrying amount exceeds the estimated undiscounted future cash flows, the second step of the impairment test is performed and an impairment charge is recognized in the amount by which the carrying amount of the asset exceeds its fair value. Assets to be disposed of would be separately presented in the balance sheet and reported at the lower of the carrying amount or fair value less costs to sell, and are no longer depreciated. The assets and liabilities of a disposal group classified as held for sale would be presented separately in the appropriate asset and liability sections of the balance sheet.
	Goodwill. Goodwill is reviewed for impairment on an annual basis or whenever events or changes in circumstances indicate the carrying value of the goodwill may be impaired. In regards to the annual test, we have the option to first assess qualitative factors to determine whether the existence of events or circumstances leads to a determination that it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If we determine it is not more likely than not that the fair value of a reporting unit is less than its carrying amount, then performing the two-step impairment test is unnecessary. During fiscal 2013 and fiscal 2012, we assessed the qualitative factors which could affect the fair values of our reporting units and determined that it was not more likely than not that the fair values of each reporting unit was less than its carrying amount.
	Other Assets. Other assets consist primarily of deposits and the equity value of an investment in a joint venture.
	Other Accrued Liabilities. Other accrued liabilities consist primarily of accrued customer rebates which we expect to settle in cash of $13.7 million and $6.4 million as of December 28, 2013 and December 29, 2012, respectively. Also included are accrued commissions, product warranties, insurance liabilities and other current liabilities.
	Product Warranties. We warrant our products against certain defects in material and workmanship when used as designed on the vehicle on which it was originally installed. We offer a limited lifetime warranty on all of our products. Our warranty limits the customer’s remedy to the repair or replacement of the part that is defective. Estimated warranty costs are based upon actual experience and forecasts using the best historical and current claim information available.
	The following table summarizes the activity of our product warranty liability included in other accrued liabilities in the accompanying Consolidated Balance Sheets:
	(in thousands)		2013			2012			2011
	Balance at beginning of year		$	286		$	70		$	25
	Provisions for warranty costs			1,249			1,064			586
	Claims paid			(1,445	)		(848	)		(541	)
	Balance at end of year		$	90		$	286		$	70
	Revenue Recognition. Revenue is recognized from product sales when goods are shipped, title and risk of loss have been transferred to the customer and collection is reasonably assured. We record estimates for cash discounts, product returns and warranties, discounts and promotional rebates in the period of the sale (“Customer Credits”). The provision for Customer Credits is recorded as a reduction from gross sales and reserves for Customer Credits are shown as a reduction of accounts receivable. Accrued customer credits which we expect to settle in cash are classified as other accrued liabilities. Actual Customer Credits have not differed materially from estimated amounts for each period presented. Amounts billed to customers for shipping and handling are included in net sales. Costs associated with shipping and handling are included in cost of goods sold.
	Research and Development. Research and development costs are expensed as incurred. Research and development costs totaling $13.4 million in fiscal 2013, $10.5 million in fiscal 2012 and $8.6 million in fiscal 2011 have been recorded in selling, general and administrative expenses in the Consolidated Statements of Operations.
	Stock-Based Compensation. At December 28, 2013 and December 29, 2012, we had one stock-based employee compensation plan, which is described more fully in Note 12, Capital Stock. We record equity-classified compensation expense for all awards granted. The fair value of stock options granted was determined using the Black-Scholes model. The value of restricted stock issued is based on the fair value of our common stock on the grant date.
	Income Taxes. We follow the asset and liability method of accounting for deferred income taxes. Deferred tax assets and liabilities are determined based on the difference between the financial statement and tax bases of assets and liabilities. Deferred tax assets or liabilities at the end of each period are determined using the tax rate expected to be in effect when taxes are actually paid or recovered.
	Foreign Currency Translation. Assets and liabilities of our foreign subsidiaries are translated into U.S. dollars at the rate of exchange prevailing at the end of the year. Income statement accounts are translated at the average exchange rate prevailing during the year. Translation adjustments resulting from this process are recorded directly in shareholders’ equity.
	Comprehensive Income. Comprehensive income includes all changes to shareholders’ equity during a period, except those resulting from investment by and distributions to shareholders. Components of comprehensive income include net income and changes in foreign currency translation adjustments.
	Concentrations of Risk. Financial instruments that potentially subject us to concentrations of credit risk consist primarily of cash equivalents and accounts receivable. All cash equivalents are managed within established guidelines which limit the amount which may be invested with one issuer. A significant percentage of our accounts receivable have been, and will continue to be, concentrated among a relatively small number of automotive retailers and warehouse distributors in the United States. Our five largest customers accounted for 81% and 86% of net accounts receivable as of December 28, 2013 and December 29, 2012, respectively. We continually monitor the credit terms and credit limits to these and other customers. In fiscal 2013, approximately 75% of our products were purchased from suppliers located in a variety of foreign countries, with the largest portion coming from China.
	Fair Value Disclosures. The carrying value of financial instruments such as cash, accounts receivable, accounts payable, and other current assets and liabilities approximate their fair value based on the short-term nature of these instruments. We did not hold any foreign currency forward contracts at December 28, 2013 or December 29, 2012.

New_and_Recently_Adopted_Accou

New and Recently Adopted Accounting Pronouncements	12 Months Ended
	Dec. 28, 2013
Accounting Changes And Error Corrections [Abstract]	'
New and Recently Adopted Accounting Pronouncements	'
	2	New and Recently Adopted Accounting Pronouncements
	In June 2011, the Financial Accounting Standards Board (“FASB”) issued an update to its authoritative guidance which allows only two options for presenting the components of net income and other comprehensive income: (1) in a single continuous financial statement or (2) in two separate but consecutive financial statements. The guidance is effective in two stages. The requirement to present a single continuous statement or two separate but consecutive statements was effective for us beginning January 1, 2012. The second stage requires us to disclose the effects of reclassification adjustments from other comprehensive income to net income and was effective for us on December 30, 2012. For items reclassified in their entirety, we are required to disclose the effect of the reclassification on each line of net income that is affected by the reclassification adjustment. For items not reclassified in their entirety, we are required to add a cross reference to the U.S. GAAP disclosure that includes additional information about the effect of the reclassification. The adoption of these updates affect presentation only and therefore did not impact our results of operations, financial condition or cash flows. Other comprehensive loss of $2.8 million for the fiscal year ended December 29, 2012 is related to currency translation adjustments at our discontinued operations which is discussed in Note 4.

Acquisition

Acquisition	12 Months Ended
	Dec. 28, 2013
Business Combinations [Abstract]	'
Acquisition	'
	3	Acquisition
	On May 17, 2013, we acquired certain assets and assumed certain liabilities of Re-Involt Technologies, LLC, a remanufacturer of hybrid battery systems, primarily to expand our product portfolio. The purchase price was approximately $3.7 million, comprised of $1.9 million in cash and $1.8 million of estimated contingent payments to the former owner. The contingent payment arrangement is based upon future earnings levels of the acquired business. In connection with this acquisition, we recorded $3.6 million in goodwill and other intangible assets, all of which are expected to be deductible for tax purposes. The financial results of the acquired business have been included in the Consolidated Financial Statements since the acquisition date.

Discontinued_Operations

Discontinued Operations	12 Months Ended
	Dec. 28, 2013
Discontinued Operations And Disposal Groups [Abstract]	'
Discontinued Operations	'
	4	Discontinued Operations
	On September 21, 2011, we announced our plan to exit the international portion of our ScanTech business due to continued operating losses and to focus on growing our North American business. ScanTech was headquartered outside Stockholm, Sweden and distributed a line of Volvo and Saab replacement parts throughout the world.
	The following table summarizes ScanTech’s net sales and income (loss) before taxes which have been presented as a discontinued operation in the Consolidated Statements of Operations:
	(in thousands)		December 28,		December 29,		December 31,
			2013		2012		2011
	Net sales		$	—	$	2,907	$	15,855
	Income (loss) before taxes			—		3,203		(3,027	)
	During fiscal 2012, we reclassified approximately $3.0 million of previously recorded currency translation adjustments from accumulated other comprehensive income to net income as a result of the substantial liquidation of our investment and recorded a deferred tax asset of $1.4 million related to foreign tax credits we expect to utilize in the future. In fiscal 2011, we recorded charges of $2.2 million to write-down inventory and tooling and $0.4 million for other asset write-downs and employee related costs.

Inventories

Inventories	12 Months Ended
	Dec. 28, 2013
Inventory Disclosure [Abstract]	'
Inventories	'
	5	Inventories
	Inventories include the cost of material, freight, direct labor and overhead utilized in the processing of our products. Inventories were as follows:
	(in thousands)		December 28,		December 29,
			2013		2012
	Bulk product		$	63,550	$	49,121
	Finished product			97,742		93,466
	Packaging materials			3,129		2,683
	Total		$	164,421	$	145,270

Property_Plant_and_Equipment

Property, Plant and Equipment	12 Months Ended
	Dec. 28, 2013
Property Plant And Equipment [Abstract]	'
Property, Plant and Equipment	'
	6	Property, Plant and Equipment
	Property, plant and equipment consists of the following:
	(in thousands)		December 28,			December 29,
			2013			2012
	Buildings		$	26,859		$	20,460
	Machinery, equipment and tooling			58,620			48,830
	Furniture, fixtures and leasehold improvements			3,833			3,384
	Software and computer equipment			53,915			48,299
	Total			143,227			120,973
	Less-accumulated depreciation and amortization			(78,441	)		(72,215	)
	Property, plant and equipment, net		$	64,786		$	48,758

LongTerm_Debt

Long-Term Debt	12 Months Ended
	Dec. 28, 2013
Debt Disclosure [Abstract]	'
Long-Term Debt	'
	7	Long-Term Debt
	Our Revolving Credit Facility, which provides for borrowings up to $30.0 million, will expire in June 2015. Borrowings under the facility are on an unsecured basis with interest at rates ranging from LIBOR plus 75 basis points to LIBOR plus 250 basis points based upon the achievement of certain benchmarks related to the ratio of funded debt to EBITDA. The interest rate at December 28, 2013 was LIBOR plus 75 basis points (0.92 %). There were no borrowings under the Revolving Credit Facility at December 28, 2013 or December 29, 2012. We did not borrow under the Revolving Credit Facility during 2013 or 2012. The loan agreement also contains covenants, the most restrictive of which pertain to net worth and the ratio of debt to EBITDA. We are in compliance with all financial covenants contained in the Revolving Credit Facility as of December 28, 2013.

Operating_Lease_Commitments_an

Operating Lease Commitments and Rent Expense	12 Months Ended
	Dec. 28, 2013
Leases [Abstract]	'
Operating Lease Commitments and Rent Expense	'
	8	Operating Lease Commitments and Rent Expense
	We lease certain equipment and operating facilities, including our primary operating facility which is leased from a partnership described in Note 9, Related Party Transactions, under non-cancelable operating leases. Approximate future minimum rental payments as of December 28, 2013 under these leases are summarized as follows:
	(in thousands)
	2014		$	3,115
	2015			2,843
	2016			2,843
	2017			2,853
	2018			894
	Thereafter			—
	Total		$	12,548
	Rent expense, including payments for short-term equipment and storage rentals, was $3.7 million in each of fiscal 2013 and fiscal 2011 and, $3.5 million in fiscal 2012.

Related_Party_Transactions

Related Party Transactions	12 Months Ended
	Dec. 28, 2013
Related Party Transactions [Abstract]	'
Related Party Transactions	'
	9	Related Party Transactions
	We have a non-cancelable operating lease for our primary operating facility from a partnership in which Steven L. Berman, our Chairman and Chief Executive Officer, and his family members are partners. Total rental payments each year to the partnership under the lease arrangement were $1.5 million in each of fiscal 2013 and fiscal 2012, and were $1.4 million in fiscal 2011. During 2012, we entered into a new lease with the partnership which expires December 31, 2017. In the opinion of our Audit Committee, the terms and rates of this lease are no less favorable than those which could have been obtained from an unaffiliated party.
	We are a partner in a joint venture with one of our suppliers. Purchases from this joint venture were $5.6 million, $5.4 million and $1.7 million in fiscal 2013, fiscal 2012 and fiscal 2011, respectively.

Income_Taxes

Income Taxes	12 Months Ended
	Dec. 28, 2013
Income Tax Disclosure [Abstract]	'
Income Taxes	'
	10	Income Taxes
	The components of the income tax provision (benefit) are as follows:
	(in thousands)		2013			2012			2011
	Current:
	Federal		$	42,458		$	37,192		$	30,952
	State			3,105			2,895			2,377
				45,563			40,087			33,329
	Deferred:
	Federal			249			(2,214	)		(1,927	)
	State			18			(170	)		(70	)
				267			(2,384	)		(1,997	)
	Total		$	45,830		$	37,703		$	31,332
	Also, the income tax benefit related to our discontinued operations was $1.4 million and $0.1 million for the years ended December 29, 2012 and December 31, 2011, respectively.
	The following is a reconciliation of income taxes at the statutory tax rate to the Company’s effective tax rate:
			2013			2012			2011
	Federal taxes at statutory rate			35	%		35	%		35	%
	State taxes, net of federal tax benefit			1.6			1.7			1.7
	Proceeds from 2011 receipt of officer’s life insurance			—			—			(0.8	)
	Stock-based compensation			—			0.1			0.1
	Research and development tax credit			(0.7	)		(0.3	)		—
	Other			—			(0.3	)		(0.2	)
	Effective tax rate			35.9	%		36.2	%		35.8	%
	At December 28, 2013, we have $1.2 million of unrecognized tax benefits, $0.9 million of which would affect our effective tax rate if recognized.
	The following table summarizes the change in uncertain tax benefits for the three years ended December 28, 2013:
	(in thousands)		2013			2012			2011
	Balance at beginning of year		$	1,785		$	2,161		$	2,532
	Reductions due to lapses in statutes of limitations			(30	)		(44	)		(65	)
	Reductions due to payments for tax positions settled			(271	)		(379	)		(702	)
	Reductions due to reversals of prior year positions			(736	)		(651	)		(210	)
	Additions based on tax positions taken during the current period			453			698			606
	Balance at end of year		$	1,201		$	1,785		$	2,161
	We recognize interest and penalties related to uncertain tax positions in income tax expense. As of December 28, 2013, we have approximately $0.2 million of accrued interest related to uncertain tax positions.
	Deferred income taxes result from timing differences in the recognition of revenue and expense for tax and financial statement purposes. The sources of temporary differences are as follows:
	(in thousands)		December 28,			December 29,
			2013			2012
	Assets:
	Inventories		$	6,546		$	6,779
	Accounts receivable			12,390			10,847
	Accrued expenses			1,928			2,079
	Other			417			1,764
	Gross deferred tax assets			21,281			21,469
	Liabilities:
	Depreciation			9,136			3,367
	Goodwill			9,343			9,231
	Other			484			991
	Gross deferred tax liabilities			18,963			13,589
	Net deferred tax assets		$	2,318		$	7,880
	Based on our history of taxable income and our projection of future earnings, we believe that it is more likely than not that sufficient taxable income will be generated in the foreseeable future to realize the remaining net deferred tax assets.
	We file income tax returns in the United States. All years before 2010 are closed for federal tax purposes. In regard to state tax, we are currently under examination by one state tax authority for years 2008-2010. Tax years before 2009 are closed for the remaining states in which we file. We filed tax returns in Sweden through 2012 and all years prior to 2008 are closed. It is reasonably possible that audit settlements, the conclusion of current examinations or the expiration of the statute of limitations could impact the Company’s unrecognized tax benefits.

Commitments_and_Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 28, 2013
Commitments And Contingencies Disclosure [Abstract]	'
Commitments and Contingencies	'
	11	Commitments and Contingencies
	Shareholder Agreement. A shareholder agreement was entered into in September 1990 and amended and restated on July 1, 2006. Under the agreement, each of the late Richard Berman, Steven Berman, Jordan Berman, Marc Berman, Fred Berman, Deanna Berman and additional shareholders named in the agreement has, among other things, granted the others of them rights of first refusal, exercisable on a pro rata basis or in such other proportions as the exercising shareholders may agree, to purchase shares of our common stock which any of them, or upon their deaths their respective estates, proposes to sell to third parties. We have agreed with these shareholders that, upon their deaths, to the extent that any of their shares are not purchased by any of these surviving shareholders and may not be sold without registration under the Securities Exchange Act of 1933, as amended (the “1933 Act”), we will use our best efforts to cause those shares to be registered under the 1933 Act. The expenses of any such registration will be borne by the estate of the deceased shareholder. The additional shareholders party to the agreement are trusts affiliated with the late Richard Berman, Steven Berman, Jordan Berman, Marc Berman or Fred Berman, or each person’s respective spouse or children.
	Legal Proceedings. We are a party to or otherwise involved in legal proceedings that arise in the ordinary course of business, such as various claims and legal actions involving contracts, competitive practices, patent rights, trademark rights, product liability claims and other matters arising out of the conduct of our business. In the opinion of management, none of the actions, individually or in the aggregate, would likely have a material financial impact on us and we believe the range of reasonably possible losses from current matters is immaterial.

Capital_Stock

Capital Stock	12 Months Ended
	Dec. 28, 2013
Equity [Abstract]	'
Capital Stock	'
	12	Capital Stock
	Controlling Interest by Officers, Directors and Family Members. As of February 18, 2014, the estate of the late Richard Berman, Sharyn Berman, Steven Berman, who is Chairman and Chief Executive Officer and director of the Company, his father and his brothers beneficially own approximately 26% of the outstanding shares of our Common Stock have a controlling influence over the election of our Board of Directors, the outcome of most corporate actions requiring shareholder approval (including certain fundamental transactions) and the affairs of the Company.
	Undesignated Stock. We have 50,000,000 shares authorized of undesignated capital stock for future issuance. The designation, rights and preferences of such shares will be determined by our Board of Directors.
	Dividend. On December 5, 2012, we announced a special cash dividend of $1.50 per share payable on December 28, 2012 to shareholders of record at the close of business on December 17, 2012. This dividend resulted in a cash payment of $54.7 million to our shareholders.
	Incentive Stock Plan. Our 2008 Stock Option and Stock Incentive Plan (the “Plan”) was approved by our shareholders on May 20, 2009. Under the terms of the Plan, our Board of Directors may grant up to 2,000,000 shares of common stock in the form of shares of restricted stock, incentive stock options and non-qualified stock options or combinations thereof to officers, directors, employees, consultants and advisors. Grants under the Plan must be made within ten years of the date the Plan was approved and stock options are exercisable upon the terms set forth in the grant agreement approved by the Board of Directors, but in no event more than ten years from the date of grant. At December 28, 2013, 1,724,826 shares were available for grant under the Plan.
	We grant restricted stock to certain employees and members of our Board of Directors. The value of restricted stock issued is based on the fair value of our common stock on the grant date. Vesting of restricted stock is conditional based on continued employment or service for a specified period. Compensation cost related to the stock is recognized on a straight-line basis over the vesting period. We retain the restricted stock, and any dividends paid thereto, until the vesting provisions have been met. Compensation cost related to restricted stock was $881,000, $803,000 and $426,000 before taxes in fiscal 2013, fiscal 2012 and fiscal 2011, respectively.
	The following table summarizes our restricted stock activity for the three years ended December 28, 2013:
			Shares			Weighted
						Average Price
	Balance at December 25, 2010			45,000		$	7.84
	Granted			178,800		$	19.12
	Vested			(9,000	)	$	7.84
	Cancelled			(10,000	)	$	19.4
	Balance at December 31, 2011			204,800		$	17.12
	Granted			15,000		$	26.7
	Vested			(45,646	)	$	16.84
	Balance at December 29, 2012			174,154		$	18.02
	Granted			25,500		$	45.06
	Vested			(47,069	)	$	17.38
	Cancelled			(43,126	)	$	18.28
	Balance at December 28, 2013			109,459		$	24.47
	As of December 28, 2013, there was approximately $2.1 million of unrecognized compensation cost related to nonvested restricted stock, which is expected to be recognized over a weighted-average period of approximately 2.8 years.
	Cash flows resulting from tax deductions in excess of the tax effect of compensation cost recognized in the financial statements are classified as financing cash flows. The excess tax benefit generated from restricted shares which were vested in fiscal 2013 and fiscal 2012 was $0.3 million in both periods and was credited to additional paid in capital.
	We grant stock options to certain employees and members of our Board of Directors. We expense the grant-date fair value of stock options. Compensation cost is recognized on a straight-line basis over the vesting period which related services are performed. The compensation cost charged against income for the year ended December 28, 2013, December 29, 2012 and December 31, 2011 was $79,000, $204,000 and $194,000 before taxes, respectively. The compensation costs were classified as selling, general and administrative expense in the Consolidated Statements of Operations. No cost was capitalized during fiscal 2013, fiscal 2012 or fiscal 2011.
	No stock options were granted in fiscal 2013 or fiscal 2011. In fiscal 2012, we used the Black-Scholes option valuation model to estimate the fair value of stock options granted. Expected volatility and expected dividend yield are based on the actual historical experience of our common stock. The expected life represents the period of time that options granted are expected to be outstanding and was calculated using historical option exercise data. The risk-free rate is based on the U.S. Treasury security with terms equal to the expected time of exercise as of the grant date. The weighted-average grant-date fair value of options granted during fiscal 2012 was $11.05 per option. We included a forfeiture assumption of 5.4% in the calculation of expense in fiscal 2013, fiscal 2012 and fiscal 2011.
	The following table summarizes the valuation assumptions used to calculate the fair value of options granted:
			2012
	Expected dividend yield			0	%
	Expected stock price volatility			59	%
	Risk-free interest rate			0.9	%
	Expected life of options			4.7 years
	The following table summarizes our stock option stock option activity for the three years ended December 28, 2013:
			Shares			Option Price per		Weighted		Weighted		Aggregate
						Share		Average		Average		Intrinsic
								Price		Remaining		Value
										Terms (years)
	Balance at December 25, 2010			990,900		$	0.47 – $19.37	$	4.54
	Exercised			(298,100	)	$	0.47 – $  7.74	$	2.41
	Balance at December 31, 2011			692,800		$	2.00 – $19.37	$	5.46
	Granted			20,000			$22.71	$	22.71
	Exercised			(438,800	)	$	2.00 – $  7.74	$	4.27
	Balance at December 29, 2012			274,000		$	2.54 – $22.71	$	8.62
	Exercised			(96,500	)	$	2.54 – $22.71	$	7.21
	Cancelled			(36,000	)	$	7.74 – $22.71	$	16.98
	Balance at December 28,2013			141,500		$	5.05 – $19.37	$	7.13		3.9	$	6,786,000
	Options exercisable at December 28, 2013			131,500		$	5.05 – $19.37	$	7.09		3.7	$	6,313,000
	The total intrinsic value of stock options exercised during fiscal 2013 was $3.3 million. As of December 28, 2013, there was approximately $0.1 million of unrecognized compensation cost related to non-vested stock options, which is expected to be recognized over a weighted-average period of approximately 1.6 years.
	The following table summarizes information concerning currently outstanding and exercisable options at December 28, 2013:
			Options Outstanding							Options Exercisable
	Range of Exercise Price		Number			Weighted-		Weighted-		Number		Weighted-
			Outstanding			Average		Average		Exercisable		Average
						Remaining		Exercise Price				Exercise Price
						Contractual
						Life (years)
	$  5.05 – $5.67			29,000			4.9	$	5.65		29,000	$	5.65
	$  6.24 – $6.90			87,500			2.9	$	6.65		87,500	$	6.65
	$  7.74			19,000			6	$	7.74		9,000	$	7.74
	$19.37			6,000			7	$	19.37		6,000	$	19.37
	Balance at December 28, 2013			141,500			3.9	$	7.13		131,500	$	7.09
	Cash received from option exercises during fiscal 2013 and fiscal 2012 was $0.6 million and $1.6 million, respectively. The excess tax benefit generated from option exercises during fiscal 2013 and fiscal 2012 was approximately $0.8 million and $2.4 million, respectively, and was credited to additional paid in capital.
	Performance-Based Long Term Award Program. In December 2012, the Compensation Committee of our Board of Directors approved the Performance-Based Long Term Award Program which connects compensation for certain of our executives to the compounded annual growth in our pre-tax income, as defined in the program, over our most recent three fiscal years. At the discretion of the Compensation Committee, the Performance-Based Long Term Award will be paid in either cash or equity. If the award is paid in equity, it will be paid under the 2008 Stock Option and Stock Incentive Plan. This is a liability-classified award. For fiscal 2013, the Compensation Committee elected to settle the award in cash.
	Employee Stock Purchase Plan. In March 1992, our Board of Directors adopted the Employee Stock Purchase Plan which was subsequently approved by the shareholders. The Employee Stock Purchase Plan permitted the grant of options to purchase up to 1,200,000 shares of common stock by our employees. In any given year, employees were able purchase up to 4% of their annual compensation, with the option price set at 85% of the fair market value of the stock on the date of exercise. All options granted during any year expired on the last day of the fiscal year. During fiscal 2011, optionees exercised rights to purchase 1,984 shares at prices from $12.68 to $16.38 per share for total net proceeds of $28,600. Our Board of Directors cancelled this plan effective December 31, 2011.
	401(k) Retirement Plan. The Dorman Products, Inc. 401(k) Retirement Plan and Trust (the “401(k) Plan”) is a defined contribution profit sharing and 401(k) plan covering substantially all of our employees as of December 28, 2013. Annual contributions under the 401(k) Plan are determined by our Board of Directors. Total expense related to the 401(k) Plan was $1.9 million, $2.0 million and $1.6 million in fiscal 2013, fiscal 2012 and fiscal 2011 respectively. At December 28, 2013, the 401(k) Plan held 422,968 shares of our common stock.
Common Stock Repurchases. We periodically repurchase, at the then current market price, and cancel common stock issued to the 401(k) Plan. Shares are generally purchased from the 401(k) Plan when participants sell units as permitted by the 401(k) Plan or elect to leave the 401(k) Plan upon retirement, termination or other reasons. During fiscal 2013, our Board of Directors approved the repurchase and cancellation of 78,580 shares of our common stock at an average price of $44.39 per share. During fiscal 2012, our Board of Directors approved the repurchase and cancellation of 70,208 shares of our common stock at an average price of $27.68 per share.
Share Repurchase Program. On December 12, 2013, we announced that our Board of Directors authorized the repurchase of up to $10,000,000 of our outstanding common stock. No shares were repurchased under the program in fiscal 2013.

Earnings_Per_Share

Earnings Per Share	12 Months Ended
	Dec. 28, 2013
Earnings Per Share [Abstract]	'
Earnings Per Share	'
	13	Earnings Per Share
	Basic earnings per share was calculated by dividing our net income by the weighted average number of common shares outstanding during the period, excluding nonvested restricted stock which is considered to be contingently issuable. To calculate diluted earnings per share, common share equivalents are added to the weighted average number of common shares outstanding. Common share equivalents are computed based on the number of outstanding stock options and nonvested restricted stock as calculated using the treasury stock method. However, in periods when the exercise price of our stock options, by grant, is greater than our average stock price during the period, those common share equivalents are considered anti-dilutive and are excluded from the calculation of diluted earnings per share. Options to purchase 20,000 and 30,000 shares of common stock were outstanding at December 29, 2012 and December 31, 2011, respectively, but were excluded from the calculation of diluted earnings per share as their effect would have been anti-dilutive.
	The following table sets forth the computation of basic earnings per share and diluted earnings per share:
	(in thousands, except per share data)		2013		2012		2011
	Numerator:
	Income from continuing operations		$	81,920	$	66,405	$	56,202
	Income (loss) from discontinued operations			—		4,557		(2,925	)
	Net income		$	81,920	$	70,962	$	53,277
	Denominator:
	Weighted average basic shares outstanding			36,347		36,124		35,866
	Effect of compensation awards			277		370		504
	Weighted average diluted shares outstanding			36,624		36,494		36,370
	Earnings Per Share:
	Basic:
	Income from continuing operations		$	2.25	$	1.84	$	1.57
	Income (loss) from discontinued operations			—		0.12		(0.08	)
	Net income		$	2.25	$	1.96	$	1.49
	Diluted:
	Income from continuing operations		$	2.24	$	1.82	$	1.55
	Income (loss) from discontinued operations			—		0.12		(0.08	)
	Net income		$	2.24	$	1.94	$	1.47

Business_Segments

Business Segments	12 Months Ended
	Dec. 28, 2013
Segment Reporting [Abstract]	'
Business Segments	'
	14	Business Segments
	We have determined that our business comprises a single reportable operating segment, namely, the sale of replacement parts for the automotive aftermarket.
	During fiscal 2013, fiscal 2012 and fiscal 2011, our four largest customers (Autozone, Advance Auto Parts, O’Reilly Auto Parts and Genuine Parts Co.) each accounted for more than 10% of net sales and in the aggregate accounted for 57% of net sales in each period. Net sales to countries outside the United States, primarily to Europe, Mexico, the Middle East, Asia and Canada in fiscal 2013, fiscal 2012 and fiscal 2011 were $33.2 million, $23.5 million and $13.9 million, respectively.

Quarterly_Results_of_Operation

Quarterly Results of Operations	12 Months Ended
	Dec. 28, 2013
Quarterly Financial Information Disclosure [Abstract]	'
Quarterly Results of Operations	'
	15	Quarterly Results of Operations (Unaudited)
	The following is a summary of the unaudited quarterly Results of Operations for the fiscal years ended December 28, 2013 and December 29, 2012:
	(in thousands, except per share amounts)		First		Second		Third		Fourth
			Quarter		Quarter		Quarter		Quarter
			2013
	Net sales		$	154,443	$	162,261	$	177,953	$	169,809
	Income from operations			29,908		30,754		35,670		31,607
	Income from continuing operations			19,072		19,342		22,887		20,619
	Income from discontinued operations			—		—		—		—
	Net income			19,072		19,342		22,887		20,619
	Diluted earnings per share			0.52		0.53		0.62		0.56
			2012
	Net sales		$	134,823	$	144,172	$	156,411	$	135,014
	Income from operations			24,407		25,727		31,131		22,966
	Income from continuing operations			15,294		16,106		19,756		15,249
	Income from discontinued operations			284		3,636		586		51
	Net income			15,578		19,742		20,342		15,300
	Diluted earnings per share			0.43		0.54		0.56		0.42

Schedule_II_Valuation_and_Qual

Schedule II: Valuation and Qualifying Accounts	12 Months Ended
	Dec. 28, 2013
Valuation And Qualifying Accounts [Abstract]	'
Schedule II: Valuation and Qualifying Accounts	'
	SCHEDULE II: Valuation and Qualifying Accounts
	(in thousands)	For the Year Ended
		December			December			December
		28, 2013			29, 2012			31, 2011
	Allowance for doubtful accounts:
	Balance, beginning of period	$	1,120		$	1,397		$	1,015
	Provision		194			266			516
	Charge-offs		(33	)		(228	)		(134	)
	Discontinued operations		—			(315	)		—
	Balance, end of period	$	1,281		$	1,120		$	1,397
	Allowance for customer credits:
	Balance, beginning of period	$	55,392		$	46,491		$	41,909
	Provision		141,559			127,597			111,224
	Credits issued		(132,353	)		(118,527	)		(106,642	)
	Discontinued operations		—			(169	)		—
	Balance, end of period	$	64,598		$	55,392		$	46,491

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 28, 2013
Accounting Policies [Abstract]	'
Principles of Consolidation	'
	Principles of Consolidation. The Consolidated Financial Statements include our accounts and the accounts of our wholly-owned subsidiaries. All material intercompany accounts and transactions have been eliminated in consolidation.
Use of Estimates in the Preparation of Financial Statements	'
	Use of Estimates in the Preparation of Financial Statements. The preparation of financial statements in accordance with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.
Reclassifications	'
	Reclassifications. The previously reported Consolidated Financial Statements include an adjustment to present accrued customer rebates which may be settled in cash as an accrued liability. The effect of this reclassification adjustment was a $6.4 million increase to accounts receivable and other accrued liabilities as of December 29, 2012. We believe the adjustment is inconsequential to any previous annual or interim Consolidated Financial Statements. Additionally, certain other amounts in the prior-years Consolidated Financial Statements have been reclassified to conform with current-year presentation.
Cash and Cash Equivalents	'
	Cash and Cash Equivalents. We consider all highly liquid short-term investments with original maturities of three months or less to be cash equivalents.
Sales of Accounts Receivable	'
	Sales of Accounts Receivable. We have entered into several customer sponsored programs administered by unrelated financial institutions that permit us to sell certain accounts receivable at discounted rates to the financial institutions. Transactions under these agreements were accounted for as sales of accounts receivable and were removed from our Consolidated Balance Sheet at the time of the sales transactions. During fiscal 2013, fiscal 2012 and fiscal 2011, we sold $406.4 million, $312.7 million and $208.8 million, respectively, pursuant to these agreements. If receivables had not been sold, $267.8 million and $180.5 million of additional receivables would have been outstanding at December 28, 2013 and December 29, 2012, respectively, based on standard payment terms. Selling, general and administrative expenses include $5.2 million, $4.4 million and $3.5 million in fiscal 2013, fiscal 2012 and fiscal 2011, respectively, of financing costs associated with these accounts receivable sales programs.
Inventories	'
	Inventories. Inventories are stated at the lower of cost or market. Cost is determined by the first-in, first-out method. We provide reserves for discontinued and excess inventory based upon historical demand, forecasted usage, estimated customer requirements and product line updates.
Property and Depreciation	'
	Property and Depreciation. Property, plant and equipment are recorded at cost and depreciated over their estimated useful lives, which range from three to thirty-nine years, using the straight-line method for financial statement reporting purposes and accelerated methods for income tax purposes. The costs of maintenance and repairs are expensed as incurred. Renewals and betterments are capitalized. Gains and losses on disposals are included in operating results.
	Estimated useful lives by major asset category are as follows:
	Buildings and building improvements		10 to 39 years
	Machinery, equipment and tooling		3 to 10 years
	Software and computer equipment		3 to 10 years
	Furniture, fixtures and leasehold improvements		3 to 15 years
	Long-lived assets, including property, plant and equipment, are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset or asset group may not be recoverable. The impairment review is a two-step process. First, recoverability is measured by comparing the carrying amount of an asset to the estimated undiscounted future cash flows expected to be generated by the asset. If the carrying amount exceeds the estimated undiscounted future cash flows, the second step of the impairment test is performed and an impairment charge is recognized in the amount by which the carrying amount of the asset exceeds its fair value. Assets to be disposed of would be separately presented in the balance sheet and reported at the lower of the carrying amount or fair value less costs to sell, and are no longer depreciated. The assets and liabilities of a disposal group classified as held for sale would be presented separately in the appropriate asset and liability sections of the balance sheet.
Goodwill	'
	Goodwill. Goodwill is reviewed for impairment on an annual basis or whenever events or changes in circumstances indicate the carrying value of the goodwill may be impaired. In regards to the annual test, we have the option to first assess qualitative factors to determine whether the existence of events or circumstances leads to a determination that it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If we determine it is not more likely than not that the fair value of a reporting unit is less than its carrying amount, then performing the two-step impairment test is unnecessary. During fiscal 2013 and fiscal 2012, we assessed the qualitative factors which could affect the fair values of our reporting units and determined that it was not more likely than not that the fair values of each reporting unit was less than its carrying amount.
Other Assets	'
	Other Assets. Other assets consist primarily of deposits and the equity value of an investment in a joint venture.
Other Accrued Liabilities	'
	Other Accrued Liabilities. Other accrued liabilities consist primarily of accrued customer rebates which we expect to settle in cash of $13.7 million and $6.4 million as of December 28, 2013 and December 29, 2012, respectively. Also included are accrued commissions, product warranties, insurance liabilities and other current liabilities.
Product Warranties	'
	Product Warranties. We warrant our products against certain defects in material and workmanship when used as designed on the vehicle on which it was originally installed. We offer a limited lifetime warranty on all of our products. Our warranty limits the customer’s remedy to the repair or replacement of the part that is defective. Estimated warranty costs are based upon actual experience and forecasts using the best historical and current claim information available.
	The following table summarizes the activity of our product warranty liability included in other accrued liabilities in the accompanying Consolidated Balance Sheets:
	(in thousands)	2013			2012			2011
	Balance at beginning of year	$	286		$	70		$	25
	Provisions for warranty costs		1,249			1,064			586
	Claims paid		(1,445	)		(848	)		(541	)
	Balance at end of year	$	90		$	286		$	70
Revenue Recognition	'
	Revenue Recognition. Revenue is recognized from product sales when goods are shipped, title and risk of loss have been transferred to the customer and collection is reasonably assured. We record estimates for cash discounts, product returns and warranties, discounts and promotional rebates in the period of the sale (“Customer Credits”). The provision for Customer Credits is recorded as a reduction from gross sales and reserves for Customer Credits are shown as a reduction of accounts receivable. Accrued customer credits which we expect to settle in cash are classified as other accrued liabilities. Actual Customer Credits have not differed materially from estimated amounts for each period presented. Amounts billed to customers for shipping and handling are included in net sales. Costs associated with shipping and handling are included in cost of goods sold.
Research and Development	'
	Research and Development. Research and development costs are expensed as incurred. Research and development costs totaling $13.4 million in fiscal 2013, $10.5 million in fiscal 2012 and $8.6 million in fiscal 2011 have been recorded in selling, general and administrative expenses in the Consolidated Statements of Operations.
Stock-Based Compensation	'
	Stock-Based Compensation. At December 28, 2013 and December 29, 2012, we had one stock-based employee compensation plan, which is described more fully in Note 12, Capital Stock. We record equity-classified compensation expense for all awards granted. The fair value of stock options granted was determined using the Black-Scholes model. The value of restricted stock issued is based on the fair value of our common stock on the grant date.
Income Taxes	'
	Income Taxes. We follow the asset and liability method of accounting for deferred income taxes. Deferred tax assets and liabilities are determined based on the difference between the financial statement and tax bases of assets and liabilities. Deferred tax assets or liabilities at the end of each period are determined using the tax rate expected to be in effect when taxes are actually paid or recovered.
Foreign Currency Translation	'
	Foreign Currency Translation. Assets and liabilities of our foreign subsidiaries are translated into U.S. dollars at the rate of exchange prevailing at the end of the year. Income statement accounts are translated at the average exchange rate prevailing during the year. Translation adjustments resulting from this process are recorded directly in shareholders’ equity.
Comprehensive Income	'
	Comprehensive Income. Comprehensive income includes all changes to shareholders’ equity during a period, except those resulting from investment by and distributions to shareholders. Components of comprehensive income include net income and changes in foreign currency translation adjustments.
Concentrations of Risk	'
	Concentrations of Risk. Financial instruments that potentially subject us to concentrations of credit risk consist primarily of cash equivalents and accounts receivable. All cash equivalents are managed within established guidelines which limit the amount which may be invested with one issuer. A significant percentage of our accounts receivable have been, and will continue to be, concentrated among a relatively small number of automotive retailers and warehouse distributors in the United States. Our five largest customers accounted for 81% and 86% of net accounts receivable as of December 28, 2013 and December 29, 2012, respectively. We continually monitor the credit terms and credit limits to these and other customers. In fiscal 2013, approximately 75% of our products were purchased from suppliers located in a variety of foreign countries, with the largest portion coming from China.
Fair Value Disclosures	'
	Fair Value Disclosures. The carrying value of financial instruments such as cash, accounts receivable, accounts payable, and other current assets and liabilities approximate their fair value based on the short-term nature of these instruments. We did not hold any foreign currency forward contracts at December 28, 2013 or December 29, 2012.

Summary_of_Significant_Account2

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 28, 2013
Accounting Policies [Abstract]	'
Estimated Useful Lives by Major Asset	'
	Estimated useful lives by major asset category are as follows:
	Buildings and building improvements		10 to 39 years
	Machinery, equipment and tooling		3 to 10 years
	Software and computer equipment		3 to 10 years
	Furniture, fixtures and leasehold improvements		3 to 15 years
Activity of Product Warranty Liability Included in Other Accrued Liabilities	'
	The following table summarizes the activity of our product warranty liability included in other accrued liabilities in the accompanying Consolidated Balance Sheets:
	(in thousands)	2013			2012			2011
	Balance at beginning of year	$	286		$	70		$	25
	Provisions for warranty costs		1,249			1,064			586
	Claims paid		(1,445	)		(848	)		(541	)
	Balance at end of year	$	90		$	286		$	70

Discontinued_Operations_Tables

Discontinued Operations (Tables)	12 Months Ended
	Dec. 28, 2013
Discontinued Operations And Disposal Groups [Abstract]	'
Schedule of Net Sales and Income (Loss) Before Taxes from Discontinued Operations	'
	The following table summarizes ScanTech’s net sales and income (loss) before taxes which have been presented as a discontinued operation in the Consolidated Statements of Operations:
	(in thousands)	December 28,		December 29,		December 31,
		2013		2012		2011
	Net sales	$	—	$	2,907	$	15,855
	Income (loss) before taxes		—		3,203		(3,027	)

Inventories_Tables

Inventories (Tables)	12 Months Ended
	Dec. 28, 2013
Inventory Disclosure [Abstract]	'
Inventories	'
	Inventories include the cost of material, freight, direct labor and overhead utilized in the processing of our products. Inventories were as follows:
	(in thousands)	December 28,		December 29,
		2013		2012
	Bulk product	$	63,550	$	49,121
	Finished product		97,742		93,466
	Packaging materials		3,129		2,683
	Total	$	164,421	$	145,270

Property_Plant_and_Equipment_T

Property, Plant and Equipment (Tables)	12 Months Ended
	Dec. 28, 2013
Property Plant And Equipment [Abstract]	'
Property, Plant and Equipment	'
	Property, plant and equipment consists of the following:
	(in thousands)	December 28,			December 29,
		2013			2012
	Buildings	$	26,859		$	20,460
	Machinery, equipment and tooling		58,620			48,830
	Furniture, fixtures and leasehold improvements		3,833			3,384
	Software and computer equipment		53,915			48,299
	Total		143,227			120,973
	Less-accumulated depreciation and amortization		(78,441	)		(72,215	)
	Property, plant and equipment, net	$	64,786		$	48,758

Operating_Lease_Commitments_an1

Operating Lease Commitments and Rent Expense (Tables)	12 Months Ended
	Dec. 28, 2013
Leases [Abstract]	'
Summary of Future Minimum Rental Payments under Leases	'
	Approximate future minimum rental payments as of December 28, 2013 under these leases are summarized as follows:
	(in thousands)
	2014	$	3,115
	2015		2,843
	2016		2,843
	2017		2,853
	2018		894
	Thereafter		—
	Total	$	12,548

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Dec. 28, 2013
Income Tax Disclosure [Abstract]	'
Components of Income Tax Provision (Benefit)	'
	The components of the income tax provision (benefit) are as follows:
	(in thousands)	2013			2012			2011
	Current:
	Federal	$	42,458		$	37,192		$	30,952
	State		3,105			2,895			2,377
			45,563			40,087			33,329
	Deferred:
	Federal		249			(2,214	)		(1,927	)
	State		18			(170	)		(70	)
			267			(2,384	)		(1,997	)
	Total	$	45,830		$	37,703		$	31,332
Reconciliation of Income Taxes at Statutory Tax Rate to Company's Effective Tax Rate	'
	The following is a reconciliation of income taxes at the statutory tax rate to the Company’s effective tax rate:
		2013			2012			2011
	Federal taxes at statutory rate		35	%		35	%		35	%
	State taxes, net of federal tax benefit		1.6			1.7			1.7
	Proceeds from 2011 receipt of officer’s life insurance		—			—			(0.8	)
	Stock-based compensation		—			0.1			0.1
	Research and development tax credit		(0.7	)		(0.3	)		—
	Other		—			(0.3	)		(0.2	)
	Effective tax rate		35.9	%		36.2	%		35.8	%
Change in Uncertain Tax Benefits	'
	The following table summarizes the change in uncertain tax benefits for the three years ended December 28, 2013:
	(in thousands)	2013			2012			2011
	Balance at beginning of year	$	1,785		$	2,161		$	2,532
	Reductions due to lapses in statutes of limitations		(30	)		(44	)		(65	)
	Reductions due to payments for tax positions settled		(271	)		(379	)		(702	)
	Reductions due to reversals of prior year positions		(736	)		(651	)		(210	)
	Additions based on tax positions taken during the current period		453			698			606
	Balance at end of year	$	1,201		$	1,785		$	2,161
Reconciliation of Deferred Tax Assets and Liabilities	'
	Deferred income taxes result from timing differences in the recognition of revenue and expense for tax and financial statement purposes. The sources of temporary differences are as follows:
	(in thousands)	December 28,			December 29,
		2013			2012
	Assets:
	Inventories	$	6,546		$	6,779
	Accounts receivable		12,390			10,847
	Accrued expenses		1,928			2,079
	Other		417			1,764
	Gross deferred tax assets		21,281			21,469
	Liabilities:
	Depreciation		9,136			3,367
	Goodwill		9,343			9,231
	Other		484			991
	Gross deferred tax liabilities		18,963			13,589
	Net deferred tax assets	$	2,318		$	7,880

Capital_Stock_Tables

Capital Stock (Tables)	12 Months Ended
	Dec. 28, 2013
Equity [Abstract]	'
Summary of Restricted Stock Activity	'
	The following table summarizes our restricted stock activity for the three years ended December 28, 2013:
		Shares			Weighted
					Average Price
	Balance at December 25, 2010		45,000		$	7.84
	Granted		178,800		$	19.12
	Vested		(9,000	)	$	7.84
	Cancelled		(10,000	)	$	19.4
	Balance at December 31, 2011		204,800		$	17.12
	Granted		15,000		$	26.7
	Vested		(45,646	)	$	16.84
	Balance at December 29, 2012		174,154		$	18.02
	Granted		25,500		$	45.06
	Vested		(47,069	)	$	17.38
	Cancelled		(43,126	)	$	18.28
	Balance at December 28, 2013		109,459		$	24.47
Summary of Valuation Assumptions Used to Calculate Fair Value of Options Granted	'
	The following table summarizes the valuation assumptions used to calculate the fair value of options granted:
		2012
	Expected dividend yield		0	%
	Expected stock price volatility		59	%
	Risk-free interest rate		0.9	%
	Expected life of options		4.7 years
Summary of Stock Option Activity	'
	The following table summarizes our stock option stock option activity for the three years ended December 28, 2013:
		Shares			Option Price per		Weighted		Weighted		Aggregate
					Share		Average		Average		Intrinsic
							Price		Remaining		Value
									Terms (years)
	Balance at December 25, 2010		990,900		$	0.47 – $19.37	$	4.54
	Exercised		(298,100	)	$	0.47 – $  7.74	$	2.41
	Balance at December 31, 2011		692,800		$	2.00 – $19.37	$	5.46
	Granted		20,000			$22.71	$	22.71
	Exercised		(438,800	)	$	2.00 – $  7.74	$	4.27
	Balance at December 29, 2012		274,000		$	2.54 – $22.71	$	8.62
	Exercised		(96,500	)	$	2.54 – $22.71	$	7.21
	Cancelled		(36,000	)	$	7.74 – $22.71	$	16.98
	Balance at December 28,2013		141,500		$	5.05 – $19.37	$	7.13		3.9	$	6,786,000
	Options exercisable at December 28, 2013		131,500		$	5.05 – $19.37	$	7.09		3.7	$	6,313,000
Summary of Information Concerning Currently Outstanding and Exercisable Options	'
	The following table summarizes information concerning currently outstanding and exercisable options at December 28, 2013:
		Options Outstanding							Options Exercisable
	Range of Exercise Price	Number			Weighted-		Weighted-		Number		Weighted-
		Outstanding			Average		Average		Exercisable		Average
					Remaining		Exercise Price				Exercise Price
					Contractual
					Life (years)
	$  5.05 – $5.67		29,000			4.9	$	5.65		29,000	$	5.65
	$  6.24 – $6.90		87,500			2.9	$	6.65		87,500	$	6.65
	$  7.74		19,000			6	$	7.74		9,000	$	7.74
	$19.37		6,000			7	$	19.37		6,000	$	19.37
	Balance at December 28, 2013		141,500			3.9	$	7.13		131,500	$	7.09

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	12 Months Ended
	Dec. 28, 2013
Earnings Per Share [Abstract]	'
Schedule of Computation of Basic Earnings Per Share and Diluted Earnings Per Share	'
	The following table sets forth the computation of basic earnings per share and diluted earnings per share:
	(in thousands, except per share data)	2013		2012		2011
	Numerator:
	Income from continuing operations	$	81,920	$	66,405	$	56,202
	Income (loss) from discontinued operations		—		4,557		(2,925	)
	Net income	$	81,920	$	70,962	$	53,277
	Denominator:
	Weighted average basic shares outstanding		36,347		36,124		35,866
	Effect of compensation awards		277		370		504
	Weighted average diluted shares outstanding		36,624		36,494		36,370
	Earnings Per Share:
	Basic:
	Income from continuing operations	$	2.25	$	1.84	$	1.57
	Income (loss) from discontinued operations		—		0.12		(0.08	)
	Net income	$	2.25	$	1.96	$	1.49
	Diluted:
	Income from continuing operations	$	2.24	$	1.82	$	1.55
	Income (loss) from discontinued operations		—		0.12		(0.08	)
	Net income	$	2.24	$	1.94	$	1.47

Quarterly_Results_of_Operation1

Quarterly Results of Operations (Tables)	12 Months Ended
	Dec. 28, 2013
Quarterly Financial Information Disclosure [Abstract]	'
Summary of Quarterly Results of Operations	'
	The following is a summary of the unaudited quarterly Results of Operations for the fiscal years ended December 28, 2013 and December 29, 2012:
	(in thousands, except per share amounts)	First		Second		Third		Fourth
		Quarter		Quarter		Quarter		Quarter
		2013
	Net sales	$	154,443	$	162,261	$	177,953	$	169,809
	Income from operations		29,908		30,754		35,670		31,607
	Income from continuing operations		19,072		19,342		22,887		20,619
	Income from discontinued operations		—		—		—		—
	Net income		19,072		19,342		22,887		20,619
	Diluted earnings per share		0.52		0.53		0.62		0.56
		2012
	Net sales	$	134,823	$	144,172	$	156,411	$	135,014
	Income from operations		24,407		25,727		31,131		22,966
	Income from continuing operations		15,294		16,106		19,756		15,249
	Income from discontinued operations		284		3,636		586		51
	Net income		15,578		19,742		20,342		15,300
	Diluted earnings per share		0.43		0.54		0.56		0.42

Summary_of_Significant_Account3

Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
	Contract	Contract
Summary Of Significant Accounting Policies Textual [Abstract]	'	'	'
Reclassification adjustment to increase accounts receivable and other accrued liabilities	'	$6.40	'
Highly liquid short-term investments maturity date	'Three months or less	'	'
Sale of accounts receivable	406.4	312.7	208.8
Additional receivables outstanding if receivables had not been sold	267.8	180.5	'
Factoring costs associated with the sales of accounts receivable	5.2	4.4	3.5
Accrued customer rebates	13.7	6.4	'
Research and development costs	$13.40	$10.50	$8.60
Net accounts receivable from five largest customers	81.00%	86.00%	'
Percentage of products purchased from foreign suppliers	75.00%	'	'
Number of foreign exchange forward contracts outstanding	0	0	'
Minimum [Member]	'	'	'
Summary Of Significant Accounting Policies Textual [Abstract]	'	'	'
Estimated useful life of Property, Plant and Equipment	'3 years	'	'
Maximum [Member]	'	'	'
Summary Of Significant Accounting Policies Textual [Abstract]	'	'	'
Estimated useful life of Property, Plant and Equipment	'39 years	'	'

Summary_of_Significant_Account4

Summary of Significant Accounting Policies - Estimated Useful Lives by Major Asset (Detail)	12 Months Ended
	Dec. 28, 2013
Minimum [Member]	'
Property, Plant and Equipment [Line Items]	'
Estimated useful life of Property, Plant and Equipment	'3 years
Minimum [Member] | Building and Building Improvements [Member]	'
Property, Plant and Equipment [Line Items]	'
Estimated useful life of Property, Plant and Equipment	'10 years
Minimum [Member] | Machinery, Equipment and Tooling [Member]	'
Property, Plant and Equipment [Line Items]	'
Estimated useful life of Property, Plant and Equipment	'3 years
Minimum [Member] | Software and Computer Equipment [Member]	'
Property, Plant and Equipment [Line Items]	'
Estimated useful life of Property, Plant and Equipment	'3 years
Minimum [Member] | Furniture, Fixtures and Leasehold Improvements [Member]	'
Property, Plant and Equipment [Line Items]	'
Estimated useful life of Property, Plant and Equipment	'3 years
Maximum [Member]	'
Property, Plant and Equipment [Line Items]	'
Estimated useful life of Property, Plant and Equipment	'39 years
Maximum [Member] | Building and Building Improvements [Member]	'
Property, Plant and Equipment [Line Items]	'
Estimated useful life of Property, Plant and Equipment	'39 years
Maximum [Member] | Machinery, Equipment and Tooling [Member]	'
Property, Plant and Equipment [Line Items]	'
Estimated useful life of Property, Plant and Equipment	'10 years
Maximum [Member] | Software and Computer Equipment [Member]	'
Property, Plant and Equipment [Line Items]	'
Estimated useful life of Property, Plant and Equipment	'10 years
Maximum [Member] | Furniture, Fixtures and Leasehold Improvements [Member]	'
Property, Plant and Equipment [Line Items]	'
Estimated useful life of Property, Plant and Equipment	'15 years

Summary_of_Significant_Account5

Summary of Significant Accounting Policies - Activity of Product Warranty Liability Included in Other Accrued Liabilities (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Accounting Policies [Abstract]	'	'	'
Balance at beginning of year	$286	$70	$25
Provisions for warranty costs	1,249	1,064	586
Claims paid	-1,445	-848	-541
Balance at end of year	$90	$286	$70

New_and_Recently_Adopted_Accou1

New and Recently Adopted Accounting Pronouncements - Additional Information (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 29, 2012	Dec. 31, 2011
Accounting Changes And Error Corrections [Abstract]	'	'
Other comprehensive loss related to currency translation adjustments	($2,810)	$58

Acquisition_Additional_Informa

Acquisition - Additional Information (Detail) (USD $)	0 Months Ended
In Millions, unless otherwise specified	17-May-13	Dec. 28, 2013
Business Combinations [Abstract]	'	'
Business acquisition date	17-May-13	'
Business acquisition purchase price of certain assets and assumed certain liabilities	$3.70	'
Business acquisition certain assets and assumed certain liabilities in cash	1.9	'
Business acquisition estimated contingent payments	1.8	'
Business acquisition of goodwill and other intangible assets	'	$3.60

Discontinued_Operations_Schedu

Discontinued Operations - Schedule of Net Sales and Income (Loss) Before Taxes from Discontinued Operations (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Discontinued Operations And Disposal Groups [Abstract]	'	'	'
Net sales	'	$2,907	$15,855
Income (loss) before taxes	'	$3,203	($3,027)

Discontinued_Operations_Additi

Discontinued Operations - Additional Information (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 29, 2012	Dec. 31, 2011
Discontinued Operations And Disposal Groups [Abstract]	'	'
Currency translation adjustments	$3	'
Deferred tax asset related to foreign tax credits	1.4	'
Write-down charges of inventory and tooling charges	'	2.2
Charges for asset write-downs and employee related costs	'	$0.40

Inventories_Inventories_Detail

Inventories - Inventories (Detail) (USD $)	Dec. 28, 2013	Dec. 29, 2012
In Thousands, unless otherwise specified
Inventory Disclosure [Abstract]	'	'
Bulk product	$63,550	$49,121
Finished product	97,742	93,466
Packaging materials	3,129	2,683
Total	$164,421	$145,270

Property_Plant_and_Equipment_P

Property, Plant and Equipment - Property, Plant and Equipment (Detail) (USD $)	Dec. 28, 2013	Dec. 29, 2012
In Thousands, unless otherwise specified
Property, Plant and Equipment [Line Items]	'	'
Total	$143,227	$120,973
Less-accumulated depreciation and amortization	-78,441	-72,215
Property, plant and equipment, net	64,786	48,758
Buildings [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Total	26,859	20,460
Machinery, Equipment and Tooling [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Total	58,620	48,830
Furniture, Fixtures and Leasehold Improvements [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Total	3,833	3,384
Software and Computer Equipment [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Total	$53,915	$48,299

LongTerm_Debt_Additional_Infor

Long-Term Debt - Additional Information (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 28, 2013	Dec. 29, 2012
Debt Instrument [Line Items]	'	'
Credit facility maximum borrowing capacity	$30	'
Expiration date of credit facility	30-Jun-15	'
Interest rate of credit facility	0.92%	'
Borrowings under credit facility	$0	$0
Minimum [Member]	'	'
Debt Instrument [Line Items]	'	'
LIBOR basis points	0.75%	'
Maximum [Member]	'	'
Debt Instrument [Line Items]	'	'
LIBOR basis points	2.50%	'

Operating_Lease_Commitments_an2

Operating Lease Commitments and Rent Expense - Summary of Future Minimum Rental Payments under Leases (Detail) (USD $)	Dec. 28, 2013
In Thousands, unless otherwise specified
Leases [Abstract]	'
2014	$3,115
2015	2,843
2016	2,843
2017	2,853
2018	894
Thereafter	'
Total	$12,548

Operating_Lease_Commitments_an3

Operating Lease Commitments and Rent Expense - Additional Information (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Leases [Abstract]	'	'	'
Rent expense, including payments for short-term equipment and storage rentals	$3.70	$3.50	$3.70

Related_Party_Transactions_Add

Related Party Transactions - Additional Information (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Related Party Transaction [Line Items]	'	'	'
Lease expiration date	31-Dec-17	31-Dec-17	'
Total annual rental payments to the partnership under the lease arrangement	$1.50	$1.50	$1.40
Joint Venture [Member]	'	'	'
Related Party Transaction [Line Items]	'	'	'
Purchases from joint ventures	$5.60	$5.40	$1.70

Income_Taxes_Components_of_Inc

Income Taxes - Components of Income Tax Provision (Benefit) (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Current:	'	'	'
Federal	$42,458	$37,192	$30,952
State	3,105	2,895	2,377
Current, Total	45,563	40,087	33,329
Deferred:	'	'	'
Federal	249	-2,214	-1,927
State	18	-170	-70
Deferred, Total	267	-2,384	-1,997
Total	$45,830	$37,703	$31,332

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011	Dec. 28, 2013	Dec. 25, 2010
Income Tax Disclosure [Abstract]	'	'	'	'
Income tax benefit	$1,400,000	$100,000	'	'
Net unrecognized tax benefits	1,785,000	2,161,000	1,201,000	2,532,000
Unrecognized tax benefits which would impact effective tax rate if recognized	'	'	900,000	'
Accrued interest related to uncertain tax positions	'	'	$200,000	'

Income_Taxes_Reconciliation_of

Income Taxes - Reconciliation of Income Taxes at Statutory Tax Rate to Company's Effective Tax Rate (Detail)	12 Months Ended
	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Effective Income Tax Rate Continuing Operations Tax Rate Reconciliation [Abstract]	'	'	'
Federal taxes at statutory rate	35.00%	35.00%	35.00%
State taxes, net of federal tax benefit	1.60%	1.70%	1.70%
Proceeds from 2011 receipt of officer's life insurance	'	'	-0.80%
Stock-based compensation	'	0.10%	0.10%
Research and development tax credit	-0.70%	-0.30%	'
Other	'	-0.30%	-0.20%
Effective tax rate	35.90%	36.20%	35.80%

Income_Taxes_Change_in_Uncerta

Income Taxes - Change in Uncertain Tax Benefits (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Reconciliation Of Unrecognized Tax Benefits Excluding Amounts Pertaining To Examined Tax Returns [Roll Forward]	'	'	'
Balance at beginning of year	$1,785	$2,161	$2,532
Reductions due to lapses in statutes of limitations	-30	-44	-65
Reductions due to payments for tax positions settled	-271	-379	-702
Reductions due to reversals of prior year positions	-736	-651	-210
Additions based on tax positions taken during the current period	453	698	606
Balance at end of year	$1,201	$1,785	$2,161

Income_Taxes_Reconciliation_of1

Income Taxes - Reconciliation of Deferred Tax Assets and Liabilities (Detail) (USD $)	Dec. 28, 2013	Dec. 29, 2012
In Thousands, unless otherwise specified
Assets:	'	'
Inventories	$6,546	$6,779
Accounts receivable	12,390	10,847
Accrued expenses	1,928	2,079
Other	417	1,764
Gross deferred tax assets	21,281	21,469
Liabilities:	'	'
Depreciation	9,136	3,367
Goodwill	9,343	9,231
Other	484	991
Gross deferred tax liabilities	18,963	13,589
Net deferred tax assets	$2,318	$7,880

Capital_Stock_Additional_Infor

Capital Stock - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Percentage of outstanding shares owned by controlling family	26.00%	'	'
Shares authorized of undesignated capital stock for future issuance	50,000,000	'	'
Cash dividend, per share	'	$1.50	'
Dividends paid	'	$54,716,000	'
Authorized number of common stock shares for grant	2,000,000	'	'
Date of plan approval	20-May-09	'	'
Maximum grant period from date of plan approval	'10 years	'	'
Shares available for grant under the plan	1,724,826	'	'
Compensation cost related to restricted stock	881,000	803,000	426,000
Unrecognized compensation cost related to stock options	100,000	'	'
Unrecognized compensation cost related to stock options, weighted-average period	'1 year 7 months 6 days	'	'
Tax benefit generated from compensation cost and credited to additional paid in capital	300,000	300,000	'
Compensation cost charged against income for stock options	79,000	204,000	194,000
Capitalized cost	0	0	0
Percentage of forfeiture assumption in calculation of compensation cost	5.40%	5.40%	5.40%
Intrinsic value of stock options exercised	3,300,000	'	'
Cash received from option exercises under the plan	551,000	1,606,000	629,000
Tax benefit generated from option exercises	800,000	2,400,000	'
Shares available to purchase under Employee Stock Purchase Plan	'	'	1,200,000
Options exercised	96,500	438,800	298,100
Total 401(K) expense	1,900,000	2,000,000	1,600,000
Common stock, shares held by 401(K) plan	422,968	'	'
Repurchase and cancellation of shares	78,580	70,208	'
Common stock repurchased, average price	$44.39	$27.68	'
Share repurchase program shares authorized to be repurchased	10,000,000	'	'
Shares repurchased under share repurchase program	0	'	'
Authorized date of repurchase of outstanding common stock	12-Dec-13	'	'
Incentive Stock Plan [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Weighted-average grant-date fair value of options granted	'	$11.05	'
Employee Stock Purchase Plan [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Percentage of annual compensation permitted to purchase	'	'	4.00%
Option price percentage of fair market value	'	'	85.00%
Employee Stock Purchase Plan, minimum purchase price	'	'	$12.68
Employee Stock Purchase Plan, maximum purchase price	'	'	$16.38
Proceeds from stock sales of Employee Stock Purchase Plan	'	'	28,600
Options exercised	'	'	1,984
Cash Dividend [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Cash dividend, Announcement date	'	5-Dec-12	'
Cash dividend, Payable date	'	28-Dec-12	'
Cash dividend, Record date	'	17-Dec-12	'
Restricted stock [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Unrecognized compensation cost related to stock options	$2,100,000	'	'
Unrecognized compensation cost related to stock options, weighted-average period	'2 years 9 months 18 days	'	'

Capital_Stock_Summary_of_Restr

Capital Stock - Summary of Restricted Stock Activity (Detail) (USD $)	12 Months Ended
	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Summary Of Restricted Stock Activity [Abstract]	'	'	'
Beginning Balance, Shares	174,154	204,800	45,000
Granted, Shares	25,500	15,000	178,800
Vested, Shares	-47,069	-45,646	-9,000
Cancelled, Shares	-43,126	'	-10,000
Ending Balance, Shares	109,459	174,154	204,800
Beginning Balance, Weighted Average Price	$18.02	$17.12	$7.84
Granted, Weighted Average Price	$45.06	$26.70	$19.12
Vested, Weighted Average Price	$17.38	$16.84	$7.84
Cancelled, Weighted Average Price	$18.28	'	$19.40
Ending Balance, Weighted Average Price	$24.47	$18.02	$17.12

Capital_Stock_Summary_of_Valua

Capital Stock - Summary of Valuation Assumptions Used to Calculate Fair Value of Options Granted (Detail)	12 Months Ended
	Dec. 29, 2012
Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions And Methodology [Abstract]	'
Expected dividend yield	0.00%
Expected stock price volatility	59.00%
Risk-free interest rate	0.90%
Expected life of options	'4 years 8 months 12 days

Capital_Stock_Summary_of_Stock

Capital Stock - Summary of Stock Option Activity (Detail) (USD $)	12 Months Ended
	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Beginning Balance, Shares	274,000	692,800	990,900
Granted, Shares	'	20,000	'
Granted, Weighted Average Price	'	$22.71	'
Exercised, Shares	-96,500	-438,800	-298,100
Cancelled, Shares	-36,000	'	'
Ending Balance, Shares	141,500	274,000	692,800
Beginning Balance, Weighted Average Price	$8.62	$5.46	$4.54
Options Exercisable, Shares	131,500	'	'
Exercised, Weighted Average Price	$7.21	$4.27	$2.41
Cancelled, Weighted Average Price	$16.98	'	'
Ending Balance, Weighted Average Price	$7.13	$8.62	$5.46
Options Exercisable, Option Price per Share	$7.09	'	'
Balance, Weighted Average Remaining Terms (years)	'3 years 10 months 24 days	'	'
Options Exercisable, Weighted Average Remaining Terms (years)	'3 years 8 months 12 days	'	'
Aggregate Intrinsic Value	$6,786,000	'	'
Options Exercisable, Aggregate Intrinsic Value	$6,313,000	'	'
Minimum [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Option Price per Share, Granted	'	$0	'
Beginning Balance, Option Price per Share	$2.54	$2	$0.47
Option Price per Share, Exercised	$2.54	$2	$0.47
Option Price per Share, Cancelled	$7.74	'	'
Ending Balance, Option Price per Share	$5.05	$2.54	$2
Options Exercisable, Option Price per Share	$5.05	'	'
Maximum [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Option Price per Share, Granted	'	$22.71	'
Beginning Balance, Option Price per Share	$22.71	$19.37	$19.37
Option Price per Share, Exercised	$22.71	$7.74	$7.74
Option Price per Share, Cancelled	$22.71	'	'
Ending Balance, Option Price per Share	$19.37	$22.71	$19.37
Options Exercisable, Option Price per Share	$19.37	'	'

Capital_Stock_Summary_of_Infor

Capital Stock - Summary of Information Concerning Currently Outstanding and Exercisable Options (Detail) (USD $)	12 Months Ended
	Dec. 28, 2013
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'
Number Outstanding	141,500
Weighted-Average Remaining Contractual Life (Years)	'3 years 10 months 24 days
Weighted-Average Exercise Price	$7.13
Number Exercisable	131,500
Options Exercisable, Weighted-Average Exercise Price	$7.09
Range One [Member]	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'
Option Price per share, Minimum	$5.05
Option Price per share, Maximum	$5.67
Number Outstanding	29,000
Weighted-Average Remaining Contractual Life (Years)	'4 years 10 months 24 days
Weighted-Average Exercise Price	$5.65
Number Exercisable	29,000
Options Exercisable, Weighted-Average Exercise Price	$5.65
Range Two [Member]	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'
Option Price per share, Minimum	$6.24
Option Price per share, Maximum	$6.90
Number Outstanding	87,500
Weighted-Average Remaining Contractual Life (Years)	'2 years 10 months 24 days
Weighted-Average Exercise Price	$6.65
Number Exercisable	87,500
Options Exercisable, Weighted-Average Exercise Price	$6.65
Range Three [Member]	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'
Option Price per share, Minimum	$7.74
Number Outstanding	19,000
Weighted-Average Remaining Contractual Life (Years)	'6 years
Weighted-Average Exercise Price	$7.74
Number Exercisable	9,000
Options Exercisable, Weighted-Average Exercise Price	$7.74
Range Four [Member]	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'
Option Price per share, Minimum	$19.37
Number Outstanding	6,000
Weighted-Average Remaining Contractual Life (Years)	'7 years
Weighted-Average Exercise Price	$19.37
Number Exercisable	6,000
Options Exercisable, Weighted-Average Exercise Price	$19.37

Earnings_Per_Share_Additional_

Earnings Per Share - Additional Information (Detail)	12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011
Earnings Per Share [Abstract]	'	'
Anti-dilutive options excluded from calculation of earnings per share	20,000	30,000

Earnings_Per_Share_Schedule_of

Earnings Per Share - Schedule of Computation of Basic Earnings Per Share and Diluted Earnings Per Share (Detail) (USD $)	3 Months Ended								12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 28, 2013	Sep. 28, 2013	Jun. 29, 2013	Mar. 30, 2013	Dec. 29, 2012	Sep. 29, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Numerator:	'	'	'	'	'	'	'	'	'	'	'
Income from continuing operations	$20,619	$22,887	$19,342	$19,072	$15,249	$19,756	$16,106	$15,294	$81,920	$66,405	$56,202
Income (loss) from discontinued operations	'	'	'	'	51	586	3,636	284	'	4,557	-2,925
Net income	$20,619	$22,887	$19,342	$19,072	$15,300	$20,342	$19,742	$15,578	$81,920	$70,962	$53,277
Denominator:	'	'	'	'	'	'	'	'	'	'	'
Weighted average basic shares outstanding	'	'	'	'	'	'	'	'	36,347	36,124	35,866
Effect of compensation awards	'	'	'	'	'	'	'	'	277	370	504
Weighted average diluted shares outstanding	'	'	'	'	'	'	'	'	36,624	36,494	36,370
Basic:	'	'	'	'	'	'	'	'	'	'	'
Income from continuing operations	'	'	'	'	'	'	'	'	$2.25	$1.84	$1.57
Income (loss) from discontinued operations	'	'	'	'	'	'	'	'	'	$0.12	($0.08)
Net income	'	'	'	'	'	'	'	'	$2.25	$1.96	$1.49
Diluted:	'	'	'	'	'	'	'	'	'	'	'
Income from continuing operations	'	'	'	'	'	'	'	'	$2.24	$1.82	$1.55
Income (loss) from discontinued operations	'	'	'	'	'	'	'	'	'	$0.12	($0.08)
Net income	$0.56	$0.62	$0.53	$0.52	$0.42	$0.56	$0.54	$0.43	$2.24	$1.94	$1.47

Business_Segments_Additional_I

Business Segments - Additional Information (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
	Customer
Segment Reporting [Abstract]	'	'	'
Number of customers exceeding 10% of net sales	4	'	'
Percentage of net sales	10.00%	10.00%	10.00%
Total percentage of sales to customers exceeding 10% of sales	0.57	0.57	0.57
Net sales outside of the U.S.	$33.20	$23.50	$13.90

Quarterly_Results_of_Operation2

Quarterly Results of Operations - Summary of Quarterly Results of Operations (Detail) (USD $)	3 Months Ended								12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 28, 2013	Sep. 28, 2013	Jun. 29, 2013	Mar. 30, 2013	Dec. 29, 2012	Sep. 29, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Quarterly Financial Information Disclosure [Abstract]	'	'	'	'	'	'	'	'	'	'	'
Net sales	$169,809	$177,953	$162,261	$154,443	$135,014	$156,411	$144,172	$134,823	$664,466	$570,420	$513,432
Income from operations	31,607	35,670	30,754	29,908	22,966	31,131	25,727	24,407	127,939	104,231	87,637
Income from continuing operations	20,619	22,887	19,342	19,072	15,249	19,756	16,106	15,294	81,920	66,405	56,202
Income from discontinued operations	'	'	'	'	51	586	3,636	284	'	4,557	-2,925
Net income	$20,619	$22,887	$19,342	$19,072	$15,300	$20,342	$19,742	$15,578	$81,920	$70,962	$53,277
Diluted earnings per share	$0.56	$0.62	$0.53	$0.52	$0.42	$0.56	$0.54	$0.43	$2.24	$1.94	$1.47

Schedule_II_Valuation_and_Qual1

Schedule II - Valuation and Qualifying Accounts (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Allowance for Doubtful Accounts [Member]	'	'	'
Valuation and Qualifying Accounts	'	'	'
Balance, beginning of period	$1,120	$1,397	$1,015
Provision	194	266	516
Charge-offs / Credits issued	-33	-228	-134
Discontinued operations	'	-315	'
Balance, end of period	1,281	1,120	1,397
Allowance for Customer Credits [Member]	'	'	'
Valuation and Qualifying Accounts	'	'	'
Balance, beginning of period	55,392	46,491	41,909
Provision	141,559	127,597	111,224
Charge-offs / Credits issued	-132,353	-118,527	-106,642
Discontinued operations	'	-169	'
Balance, end of period	$64,598	$55,392	$46,491