Sleep Number (SNBR) 10-K 27 Feb 15 2014 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Jan. 03, 2015	Jan. 31, 2015	Jun. 28, 2014
Entity Information [Line Items]
Entity Public Float			$957,148
Entity Registrant Name	SELECT COMFORT CORPORATION
Entity Central Index Key	827187
Current Fiscal Year End Date	-2
Entity Filer Category	Large Accelerated Filer
Document Type	10-K
Document Period End Date	3-Jan-15
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY
Amendment Flag	FALSE
Entity Common Stock, Shares Outstanding		52,670
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Jan. 03, 2015	Dec. 28, 2013
In Thousands, unless otherwise specified
Current assets:
Cash and cash equivalents	$51,995	$58,223
Marketable debt securities – current	69,609	52,159
Accounts receivable, net of allowance for doubtful accounts of $739 and $425, respectively	19,693	14,979
Inventories	53,535	40,152
Prepaid expenses	17,792	9,216
Deferred income taxes	8,786	6,936
Other current assets	11,185	7,874
Total current assets	232,595	189,539
Non-current assets:
Marketable debt securities – non-current	44,441	34,632
Property and equipment, net	165,453	129,542
Goodwill and intangible assets, net	15,986	16,823
Deferred income taxes	3,433	4,943
Other assets	12,279	6,286
Total assets	474,187	381,765
Current liabilities:
Accounts payable	84,197	73,391
Customer prepayments	28,726	15,392
Accrued sales returns	15,262	9,433
Compensation and benefits	33,066	15,242
Taxes and withholding	10,207	12,517
Other current liabilities	15,594	11,207
Total current liabilities	187,052	137,182
Non-current liabilities:
Warranty liabilities	2,722	1,567
Other long-term liabilities	27,506	17,796
Total liabilities	217,280	156,545
Shareholders' equity:
Undesignated preferred stock; 5,000 shares authorized, no shares issued and outstanding	0	0
Common stock, $0.01 par value; 142,500 shares authorized, 52,798 and 54,901 shares issued and outstanding, respectively	528	549
Additional paid-in capital	0	5,382
Retained earnings	256,413	219,276
Accumulated other comprehensive (loss) income	-34	13
Total shareholders’ equity	256,907	225,220
Total liabilities and shareholders’ equity	$474,187	$381,765

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Jan. 03, 2015	Dec. 28, 2013
In Thousands, except Per Share data, unless otherwise specified
Current assets:
Allowance for Doubtful Accounts Receivable, Current	$739	$425
Shareholders' equity:
Preferred Stock, Shares Authorized (in shares)	5,000	5,000
Preferred Stock, Shares Issued (in shares)	0	0
Preferred Stock, Shares Outstanding (in shares)	0	0
Common Stock, Par or Stated Value Per Share (in shares)	$0.01	$0.01
Common Stock, Shares Authorized (in shares)	142,500	142,500
Common Stock, Shares, Issued (in shares)	52,798	54,901
Common Stock, Shares, Outstanding (in shares)	52,798	54,901

Consolidated_Statements_of_Ope

Consolidated Statements of Operations (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Jan. 03, 2015	Dec. 28, 2013	Dec. 29, 2012
Income Statement [Abstract]
Net sales	$1,156,757	$960,171	$934,978
Cost of sales	449,907	358,416	338,432
Gross profit	706,850	601,755	596,546
Operating expenses:
Sales and marketing	512,007	439,156	398,205
General and administrative	84,864	62,967	66,765
Research and development	8,233	9,478	6,194
CEO transition (benefit) costs	0	-534	5,595
Total operating expenses	605,104	511,067	476,759
Operating income	101,746	90,688	119,787
Other income, net	362	323	218
Income before income taxes	102,108	91,011	120,005
Income tax expense	34,134	30,930	41,911
Net income	$67,974	$60,081	$78,094
Basic net income per share:
Net income per share – basic	$1.27	$1.10	$1.41
Weighted-average shares – basic	53,452	54,866	55,516
Diluted net income per share:
Net income per share – diluted	$1.25	$1.08	$1.37
Weighted-average shares – diluted	54,193	55,803	57,076

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Jan. 03, 2015	Dec. 28, 2013	Dec. 29, 2012
Statement of Comprehensive Income [Abstract]
Net income	$67,974	$60,081	$78,094
Other comprehensive loss – unrealized loss on available-for-sale marketable debt securities, net of income tax	-47	-7	-5
Comprehensive income	$67,927	$60,074	$78,089

Consolidated_Statement_of_Shar

Consolidated Statement of Shareholders' Equity (USD $)	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
In Thousands, unless otherwise specified
Balance at Dec. 31, 2011	$129,391	$564	$47,701	$81,101	$25
Balance (in shares) at Dec. 31, 2011		56,397
Comprehensive income:
Net income	78,094	0	0	78,094	0
Unrealized gain (loss) on available-for-sale marketable debt securities	-5	0	0	0	-5
Exercise of common stock options	5,138	7	5,131	0	0
Exercise of common stock options (in shares)		659
Tax effect from stock-based compensation	5,665	0	5,665	0	0
Stock-based compensation (in shares)		170
Stock-based compensation	10,306	1	10,305	0	0
Repurchases of common stock	-34,892	-13	-34,879	0	0
Repurchases of common stock (in shares)		-1,323
Balance at Dec. 29, 2012	193,697	559	33,923	159,195	20
Balance (in shares) at Dec. 29, 2012		55,903
Comprehensive income:
Net income	60,081	0	0	60,081	0
Unrealized gain (loss) on available-for-sale marketable debt securities	-7	0	0	0	-7
Exercise of common stock options	7,966	7	7,959	0	0
Exercise of common stock options (in shares)		757
Tax effect from stock-based compensation	1,007	0	1,007	0	0
Stock-based compensation (in shares)		160
Stock-based compensation	4,232	2	4,230	0	0
Repurchases of common stock	-42,072	-19	-42,053	0	0
Repurchases of common stock (in shares)		-1,919
Other	316	0	316	0	0
Other (shares)	0
Balance at Dec. 28, 2013	225,220	549	5,382	219,276	13
Balance (in shares) at Dec. 28, 2013	54,901	54,901
Comprehensive income:
Net income	67,974	0	0	67,974	0
Unrealized gain (loss) on available-for-sale marketable debt securities	-47	0	0	0	-47
Exercise of common stock options	2,873	2	2,871	0	0
Exercise of common stock options (in shares)		239
Tax effect from stock-based compensation	581	0	581	0	0
Stock-based compensation (in shares)		-96
Stock-based compensation	6,798	-1	6,799	0	0
Repurchases of common stock	-46,492	-22	-15,633	-30,837	0
Repurchases of common stock (in shares)		-2,246
Balance at Jan. 03, 2015	$256,907	$528	$0	$256,413	($34)
Balance (in shares) at Jan. 03, 2015	52,798	52,798

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Jan. 03, 2015	Dec. 28, 2013	Dec. 29, 2012
Cash flows from operating activities:
Net income	$67,974	$60,081	$78,094
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	39,809	30,811	20,401
Stock-based compensation	6,798	4,232	10,306
Net loss on disposals and impairments of assets	492	24	115
Excess tax benefits from stock-based compensation	-1,163	-3,831	-6,446
Deferred income taxes	-311	2,037	3,499
Changes in operating assets and liabilities, net of effect of acquisition:
Accounts receivable	-4,717	1,993	-2,705
Inventories	-13,383	-3,910	-10,713
Income taxes	-4,314	4,395	4,299
Prepaid expenses and other assets	-9,973	-3,169	-2,382
Accounts payable	14,340	-3,477	7,114
Customer prepayments	13,334	198	1,665
Accrued compensation and benefits	17,735	-5,202	-8,108
Other taxes and withholding	2,584	-153	765
Warranty liabilities	1,671	-1,236	-1,454
Other accruals and liabilities	13,592	5,312	6,176
Net cash provided by operating activities	144,468	88,105	100,626
Cash flows from investing activities:
Investments in marketable debt securities	-90,349	-44,170	-86,803
Purchases of property and equipment	-76,594	-76,811	-51,593
Proceeds from maturities of marketable debt securities	54,506	53,565	26,249
Investment in non-marketable equity securities	-1,500	-4,500	0
Proceeds from sales of property and equipment	5	117	45
Increase in restricted cash	-500	0	0
Acquisition of business	0	-15,500	0
Net cash used in investing activities	-114,432	-87,299	-112,102
Cash flows from financing activities:
Repurchases of common stock	-46,492	-42,072	-34,892
Net increase (decrease) in short-term borrowings	6,192	-223	6,494
Proceeds from issuance of common stock	2,873	7,966	5,138
Excess tax benefits from stock-based compensation	1,163	3,831	6,446
Debt issuance costs	0	0	-50
Net cash used in financing activities	-36,264	-30,498	-16,864
Net decrease in cash and cash equivalents	-6,228	-29,692	-28,340
Cash and cash equivalents, at beginning of period	58,223	87,915	116,255
Cash and cash equivalents, at end of period	51,995	58,223	87,915
Income taxes paid	38,474	24,253	34,181
Interest paid	49	34	81
Purchases of property and equipment included in accounts payable	$5,802	$3,465	$3,817

Business_and_Summary_of_Signif

Business and Summary of Significant Accounting Policies (Notes)	12 Months Ended
	Jan. 03, 2015
Accounting Policies [Abstract]
Business and Summary of Significant Accounting Policies	Business and Summary of Significant Accounting Policies
	Business & Basis of Presentation
	Select Comfort Corporation and our 100%-owned subsidiaries (“Select Comfort” or the “Company”) are the exclusive designer, manufacturer, marketer, retailer and servicer of a complete line of Sleep Number® beds. Only the Sleep Number bed offers SleepIQ® technology - proprietary sensor technology that works directly with the bed’s DualAir™ technology to monitor each individual’s sleep. Sleep Number also offers a full line of exclusive sleep products, including FlextFit™ adjustable base technology, Sleep Number® pillows, sheets and other bedding products.
	As the only national specialty-mattress retailer, we generate revenue by selling products through two distribution channels. Our Company-Controlled channel, which includes Retail, Direct Marketing and E-Commerce, sells directly to consumers. Our Wholesale/Other channel sells to and through selected retail and wholesale customers in the United States and Australia, and the QVC shopping channel. The consolidated financial statements include the accounts of Select Comfort Corporation and our subsidiaries. All significant intra-entity balances and transactions have been eliminated in consolidation.
	Fiscal Year
	Our fiscal year ends on the Saturday closest to December 31. Fiscal years and their respective fiscal year ends were as follows: fiscal 2014 ended January 3, 2015; fiscal 2013 ended December 28, 2013; and fiscal 2012 ended December 29, 2012. Fiscal year 2014 had 53 weeks and fiscal years 2013 and 2012 each had 52 weeks.
	Use of Estimates in the Preparation of Financial Statements
	The preparation of consolidated financial statements in conformity with U.S. generally accepted accounting principles (“GAAP”) requires us to make estimates and assumptions. These estimates and assumptions affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the consolidated financial statements, and the reported amounts of sales, expenses and income taxes during the reporting period. Predicting future events is inherently an imprecise activity and, as such, requires the use of judgment. As future events and their effects cannot be determined with precision, actual results could differ significantly from these estimates. Changes in these estimates will be reflected in the financial statements in future periods. Our critical accounting policies consist of stock-based compensation, goodwill and indefinite-lived intangible assets, warranty liabilities and revenue recognition.
	Cash and Cash Equivalents
	Cash and cash equivalents include highly liquid investments with original maturities of three months or less. The carrying value of these investments approximates fair value due to their short-term maturity. Our banking arrangements allow us to fund outstanding checks when presented to the financial institution for payment, resulting in book overdrafts. Book overdrafts are included in accounts payable in our consolidated balance sheets and in net increase (decrease) in short-term borrowings in the financing activities section of our consolidated statements of cash flows. Book overdrafts totaled $19.6 million and $13.4 million at January 3, 2015, and December 28, 2013, respectively.
	Marketable Debt Securities
	Our investment portfolio is currently comprised of U.S. government and agency securities, corporate debt securities, municipal bonds and commercial paper. The value of these securities is subject to market and credit volatility during the period these investments are held. We classify marketable debt securities as available-for-sale investments and these securities are stated at their estimated fair value. Our investments with original maturities of greater than three months but current maturities of less than one year are recorded as marketable debt securities – current. Our investments with current maturities of more than one year are recorded as marketable debt securities – non-current. Unrealized gains and losses, net of income tax, are reported as a component of accumulated other comprehensive (loss) income in our consolidated balance sheets. Other-than-temporary declines in market value, if any, from original cost are charged to other income, net in the consolidated statements of operations in the period in which the loss occurs, and a new cost basis for the security is established. In determining whether an other-than-temporary decline in the market value has occurred, we consider the duration and extent that the fair value of the investment is below its cost. Realized gains and losses, if any, are calculated on the specific identification method and are measured and reclassified from accumulated other comprehensive (loss) income in our consolidated balance sheets to other income, net in our consolidated statements of operations.
	Concentration of Credit Risk
	Our investment policy’s primary focus is to preserve principal and maintain adequate liquidity. Our investment policy addresses the concentration of credit risk by limiting the concentration in certain investment types. Our exposure to a concentration of credit risk consists primarily of cash, cash equivalents and investments. We place our cash with high-credit quality issuers. We currently hold investments in U.S. government and agency securities, corporate debt securities, municipal bonds and commercial paper. We believe no significant concentration of credit risk exists with respect to our cash, cash equivalents and investments.
	Accounts Receivable
	Accounts receivable are recorded net of an allowance for expected losses and consist primarily of receivables from wholesale customers and receivables from third-party financiers for customer credit card purchases. The allowance is recognized in an amount equal to anticipated future write-offs. We estimate future write-offs based on delinquencies, aging trends, industry risk trends and our historical experience. Account balances are charged off against the allowance when we believe it is probable the receivable will not be recovered.
	Inventories
	Inventories include materials, labor and overhead and are stated at the lower of cost or market. Cost is determined by the first-in, first-out method.
	Property and Equipment
	Property and equipment, carried at cost, is depreciated using the straight-line method over the estimated useful lives of the assets. The cost and related accumulated depreciation of assets sold or retired is removed from the accounts with any resulting gain or loss included in net income in our consolidated statements of operations. Maintenance and repairs are charged to expense as incurred. Major renewals and betterments that extend useful life are capitalized.
	Leasehold improvements are depreciated over the shorter of the estimated useful lives of the assets or the contractual term of the lease, with consideration of lease renewal options if renewal appears probable.
	Property under capital lease is comprised of computer equipment and computer software used in our retail operations and corporate support areas.
	Estimated useful lives of our property and equipment by major asset category are as follows:
	Leasehold improvements	5 to 10 years
	Furniture and equipment	5 to 7 years
	Production machinery, computer equipment and software	3 to 7 years
	Property under capital lease	3 to 4 years
	Goodwill and Intangible Assets, Net
	Goodwill is the difference between the purchase price of a company and the fair market value of the acquired company's net identifiable assets. Our intangible assets include developed technologies, trade names/trademarks and customer relationships. Definite-lived intangible assets are being amortized using the straight-line method over their estimated lives, ranging from 7-17 years.
	Asset Impairment Charges
	Long-lived Assets and Definite-lived Intangible Assets - we review our long-lived assets and definite-lived intangible assets for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. When evaluating long-lived assets for potential impairment, we first compare the carrying value of the asset to the estimated future cash flows (undiscounted and without interest charges - plus proceeds expected from disposition, if any). If the estimated undiscounted cash flows are less than the carrying value of the asset, we calculate an impairment loss. The impairment loss calculation compares the carrying value of the asset to the asset’s estimated fair value. When we recognize an impairment loss, the carrying amount of the asset is reduced to estimated fair value based on discounted cash flows, quoted market prices or other valuation techniques. Assets to be disposed of are reported at the lower of the carrying amount of the asset or fair value less costs to sell. We review retail store assets for potential impairment based on historical cash flows, lease termination provisions and expected future retail store operating results. If we recognize an impairment loss for a depreciable long-lived asset, the adjusted carrying amount of the asset becomes its new cost basis and will be depreciated (amortized) over the remaining useful life of that asset.
	Goodwill and Indefinite-lived Intangible Assets - goodwill and indefinite-lived intangible assets are not amortized, but are tested for impairment annually or when there are indicators of impairment using a fair value approach. Our test for goodwill impairment is performed at least annually or when there are any indicators of impairment. The Financial Accounting Standards Board's (FASB) guidance allows us to perform either a quantitative assessment or a qualitative assessment before calculating the fair value of a reporting unit. We have elected to perform the quantitative assessment. The quantitative goodwill impairment test is a two-step process. The first step is a comparison of the fair value of the reporting unit with its carrying amount, including goodwill. If this step reflects impairment, then the loss would be measured as the excess of recorded goodwill over its implied fair value. Implied fair value is the excess of fair value of the reporting unit over the fair value of all identified assets and liabilities. Fair value is determined using a market-based approach utilizing widely accepted valuation techniques, including quoted market prices and our market capitalization. Based on our 2014 quantitative assessment, we determined there was no impairment. Other indefinite-lived intangible assets are assessed for impairment at least annually, or when there are any indicators of impairment, by comparing the carrying value of an asset with its fair value. If the carrying value exceeds fair value, an impairment loss is recognized in an amount equal to the excess.
	Warranty Liabilities
	We provide a limited warranty on most of the products we sell. The estimated warranty costs, which are expensed at the time of sale and included in cost of sales, are based on historical trends and warranty claim rates incurred by us and are adjusted for any current trends as appropriate. Actual warranty claim costs could differ from these estimates. We regularly assess and adjust the estimate of accrued warranty claims by updating claims rates for actual trends and projected claim costs.
	We classify as non-current those estimated warranty costs expected to be paid out in greater than one year. The activity in the accrued warranty liabilities account was as follows (in thousands):
		2014			2013			2012
	Balance at beginning of period	$	4,153		$	4,858		$	6,310
	Additions charged to costs and expenses for current-year sales	9,437			4,603			4,114
	Deductions from reserves	(8,118		)	(6,070		)	(5,094		)
	Changes in liability for pre-existing warranties during the current year, including expirations	352			230			(472		)
	Acquired warranty reserve	—			532			—
	Balance at end of period	$	5,824		$	4,153		$	4,858
	Fair Value Measurements
	The guidance for fair value measurements establishes the authoritative definition of fair value, sets out a framework for measuring fair value and outlines the required disclosures regarding fair value measurements. Fair value is the price that would be received to sell an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants at the measurement date. We use a three-tier fair value hierarchy based upon observable and unobservable inputs as follows:
	•	Level 1 – observable inputs such as quoted prices in active markets;
	•	Level 2 – inputs, other than the quoted prices in active markets, that are observable either directly or indirectly including:
	◦Quoted prices for similar assets or liabilities in active markets;
	◦Quoted prices for identical or similar assets in nonactive markets;
	◦Inputs other than quoted prices that are observable for the asset or liability;
	◦Inputs that are derived principally from or corroborated by other observable market data; and
	•	Level 3 – unobservable inputs in which there is little or no market data, which require the reporting entity to develop its own assumptions.
	We generally estimate fair value of long-lived assets, including our retail stores, using the income approach, which we base on estimated future cash flows (discounted and with interest charges). The inputs used to determine fair value relate primarily to future assumptions regarding sales volumes, gross profit rates, retail store operating expenses and applicable probability weightings regarding future alternative uses. These inputs are categorized as Level 3 inputs under the fair value measurements guidance. The inputs used represent management’s assumptions about what information market participants would use in pricing the assets and are based upon the best information available at the balance sheet date.
	The fair value hierarchy requires the use of observable market data when available. In instances in which the inputs used to measure fair value fall into different levels of the fair value hierarchy, the fair value measurement has been determined based on the lowest level input that is significant to the fair value measurement in its entirety. Our assessment of the significance of a particular item to the fair value measurement in its entirety requires judgment, including the consideration of inputs specific to the asset or liability. Our financial assets are valued using market prices based on either active markets (Level 1 measurements) or less active markets (Level 2 measurements).
	Our Level 1 securities include U.S. Treasury securities as they trade with sufficient frequency and volume to enable us to obtain pricing information on a consistent basis. Our Level 2 securities include U.S. Agency bonds, corporate bonds, municipal bonds and commercial paper whose value is determined by a third-party pricing service using inputs that are observable in the market or can be derived principally from or corroborated by observable market data such as pricing for similar securities, recently executed transactions, cash flow models with yield curves and benchmark securities.
	Dividends
	We are not restricted from paying cash dividends under our credit agreement other than customary legal and contractual restrictions. However, we have not historically paid, and have no current plans to pay, cash dividends on our common stock.
	Revenue Recognition
	Revenue is recognized when the sales price is fixed or determinable, collectability is reasonably assured and title passes. Amounts billed to customers for delivery and setup are included in net sales. Revenue is reported net of estimated sales returns and excludes sales taxes.
	We accept sales returns after a 100-night trial period. The accrued sales returns estimate is based on historical return rates and is adjusted for any current trends as appropriate. If actual returns vary from expected rates, sales in future periods are adjusted.
	In fiscal 2014, we introduced our SleepIQ® technology. The SleepIQ® system is a multiple-element arrangement with deliverables that include a bed, hardware and software. We analyze our multiple-element arrangement(s) to determine whether the deliverables can be separated or whether they must be accounted for as a single unit of accounting. We determined that the SleepIQ system has two units of accounting consisting of: (i) the bed; and (ii) the hardware/software. The hardware and software are not separable as the hardware and related software are not sold separately and the software is integral to the hardware’s functionality. We valued the two units of accounting based on their relative selling prices.
	At January 3, 2015, we had deferred revenue totaling $9.4 million, of which $2.0 million and $7.4 million is included in other current liabilities and other long-term liabilities, respectively, in our consolidated balance sheet. We also have related deferred costs totaling $5.9 million, of which $1.2 million and $4.7 million is included in other current assets and other assets, respectively, in our consolidated balance sheet. There were no deferred revenue or costs at December 28, 2013. The deferred revenue and costs are recognized over the product’s estimated life of five years.
	Cost of Sales, Sales and Marketing, General and Administrative (“G&A”) and Research & Development (“R&D”) Expenses
	The following tables summarize the primary costs classified in each major expense category (the classification of which may vary within our industry):
	Cost of Sales		Sales & Marketing
•  Costs associated with purchasing, manufacturing, shipping, handling and delivering our products to our retail stores and customers;		•  Advertising and media production;
•  Physical inventory losses, scrap and obsolescence;		•  Marketing and selling materials such as brochures, videos, customer mailings and in-store signage;
•  Related occupancy and depreciation expenses;		•  Payroll and benefits for sales and customer service staff;
•  Costs associated with returns and exchanges; and		•  Store occupancy costs;
•  Estimated costs to service warranty claims of customers.		•  Store depreciation expense;
		•  Credit card processing fees; and
		•  Promotional financing costs.
G&A		R&D(1)
•  Payroll and benefit costs for corporate employees, including information technology, legal, human resources, finance, sales and marketing administration, investor relations and risk management;		•  Internal labor and benefits related to research and development activities;
•   Occupancy costs of corporate facilities;		•  Outside consulting services related to research and development activities; and
•   Depreciation related to corporate assets;		•  Testing equipment related to research and development activities.
•   Information hardware, software and maintenance;
•   Insurance;		(1) Costs incurred in connection with R&D are charged to expense as incurred.
•   Investor relations costs; and
•   Other overhead costs.
Operating Leases
We lease our retail, office and manufacturing space under operating leases which, in addition to the minimum lease payments, may require payment of a proportionate share of the real estate taxes and certain building operating expenses. Our retail store leases generally provide for an initial lease term of five to ten years with a termination option if we do not achieve certain minimum annual sales thresholds. In addition, our mall-based retail store leases may require payment of contingent rent based on net sales in excess of certain thresholds. Certain retail store leases may contain options to extend the term of the original lease.
Minimum rent expense, which excludes contingent rents, is recognized on a straight-line basis over the lease term, after consideration of rent escalations and rent holidays. We record any difference between the straight-line rent amounts and amounts payable under the leases as part of deferred rent, in other current liabilities or other long-term liabilities, as appropriate. The lease term for purposes of the calculation begins on the earlier of the lease commencement date or the date we take possession of the property. During lease renewal negotiations that extend beyond the original lease term, we estimate straight-line rent expense based on current market conditions. At January 3, 2015, and December 28, 2013, deferred rent included in other current liabilities in our consolidated balance sheets was $0.3 million and $0.5 million, respectively, and deferred rent included in other long-term liabilities in our consolidated balance sheets was $6.5 million and $5.5 million, respectively. Contingent rent expense is recorded when it is probable the expense has been incurred and the amount is reasonably estimable. Future payments for real estate taxes and certain building operating expenses for which we are obligated are not included in minimum lease payments.
Leasehold improvements that are funded by landlord incentives or allowances under an operating lease are recorded as deferred lease incentives, in other current liabilities or other long-term liabilities, as appropriate and amortized as reductions to rent expense over the lease term. At January 3, 2015, and December 28, 2013, deferred lease incentives included in other current liabilities in our consolidated balance sheets were $2.6 million and $2.0 million, respectively, and deferred lease incentives included in other long-term liabilities in our consolidated balance sheets were $8.4 million and $7.2 million, respectively.
Pre-Opening Costs
Costs associated with the start-up and promotion of new retail store openings are expensed as incurred.
Advertising Costs
We incur advertising costs associated with print, digital and broadcast advertisements. Advertising costs are charged to expense when the ad first runs. Advertising expense was $158.5 million, $144.8 million and $126.9 million in 2014, 2013 and 2012, respectively. Advertising costs deferred and included in prepaid expenses in our consolidated balance sheets were $5.3 million and $6.2 million as of January 3, 2015, and December 28, 2013, respectively.
Insurance
We are self-insured for certain losses related to health and workers’ compensation claims, although we obtain third-party insurance coverage to limit exposure to these claims. We estimate our self-insured liabilities using a number of factors including historical claims experience and analysis of incurred but not reported claims. Our self-insurance liability was $7.8 million and $6.8 million at January 3, 2015, and December 28, 2013, respectively. At January 3, 2015, and December 28, 2013, $4.4 million and $3.3 million, respectively, were included in compensation and benefits and $3.4 million and $3.5 million, respectively, were included in other long-term liabilities in our consolidated balance sheets. At January 3, 2015 and December 28, 2013, we had a restricted deposit of $3.2 million and $2.7 million, respectively,with our insurer that serves as collateral for our workers’ compensation insurance obligations and was included in other current assets in our consolidated balance sheets.
Software Capitalization
For software developed or obtained for internal use, we capitalize direct external costs associated with developing or obtaining internal-use software. In addition, we also capitalize certain payroll and payroll-related costs for employees who are directly involved with the development of such applications. Capitalized costs related to internal-use software under development are treated as construction-in-progress until the program, feature or functionality is ready for its intended use, at which time depreciation commences. We expense any data conversion or training costs as incurred.
Stock-Based Compensation
We compensate officers, directors and key employees with stock-based compensation under two stock plans approved by our shareholders in 2004 and 2010 and administered under the supervision of our Board of Directors (“Board”). At January 3, 2015, a total of 4.8 million shares were available for future grant under the 2010 stock plan. These plans include non-qualified stock options and stock awards.
We record stock-based compensation expense based on the award’s fair value at the grant date and the awards that are expected to vest. We recognize stock-based compensation expense over the period during which an employee is required to provide services in exchange for the award. We reduce compensation expense by estimated forfeitures. Forfeitures are estimated using historical experience and projected employee turnover. We include as part of cash flows from financing activities the benefit of tax deductions in excess of recognized stock-based compensation expense.
Stock Options - stock option awards are granted at exercise prices equal to the closing price of our stock on the grant date. Generally, options vest proportionally over periods of two to four years and expire after 10 years. Compensation expense is recognized ratably over the vesting period.
We determine the fair value of stock options granted and the resulting compensation expense at the date-of-grant using the Black-Scholes-Merton option-pricing model and a single option award approach. Descriptions of significant assumptions used to estimate the expected volatility, risk-free interest rate and expected term are as follows:
Expected Volatility – Expected volatility was determined based on implied volatility of our traded options and historical volatility of our stock price.
Risk-Free Interest Rate – The risk-free interest rate was based on the implied yield available on U.S. Treasury zero-coupon issues at the date of grant with a term equal to the expected term.
Expected Term – Expected term represents the period that our stock-based awards are expected to be outstanding and was determined based on historical experience and anticipated future exercise patterns, giving consideration to the contractual terms of unexercised stock-based awards.
Stock Awards - we issue stock awards to certain employees in conjunction with our stock-based compensation plan. The stock awards generally vest from two to four years based on continued employment (“time based”). Compensation expense related to stock awards, except for stock awards with a market condition, is determined on the grant date based on the publicly quoted closing price of our common stock and is charged to earnings on a straight-line basis over the vesting period. Stock awards with a market condition are valued using a Monte Carlo simulation model. The significant assumptions used to estimate the expected volatility and risk-free interest rate are similar to those described above in Stock Options.
Certain time-based stock awards have either a performance condition ("performance-based") or a market condition ("market-based").
Performance-based Stock Awards – the final number of shares earned and the related compensation expense is adjusted up or down to the extent the performance target is met as of the last day of the performance period. The actual number of shares that will ultimately be awarded range from 0% - 200% of the targeted amount for the 2014 and 2013 awards and from 0% to 150% of the targeted amount for the 2012 awards. We evaluate the likelihood of meeting the performance targets at each reporting period and adjust compensation expense, on a cumulative basis, based on the expected achievement of each of the performance targets. For performance-based stock awards granted in 2014, the performance targets are growth in net sales and in operating profit, and the performance period is fiscal 2014 through 2016. For performance-based stock awards granted in 2013, the performance targets are net sales and operating margin, and the performance period is fiscal 2015. For performance-based stock awards granted in 2012, the performance target is market share growth and the performance period is from fiscal 2012 through 2014. The market share growth calculation will be finalized in fiscal 2015 when an industry survey report is issued.
Market-based Stock Awards – the related compensation expense is fixed, however, the final number of shares earned is adjusted to the extent that the market condition is achieved during the performance period. The actual number of shares that will ultimately be awarded range from 0% to 100% of the target amount for 2014 awards. For the market-based stock awards granted in 2014, the market condition was based on increases in our stock price for a specified number of sequential days and the performance period is three years beginning on the date of grant, which was March 28, 2014. As of January 3, 2015, the market condition had been achieved. There were no market-based stock awards granted in 2013 or 2012.
See Note 10, Shareholders’ Equity, for additional information on stock-based compensation.
Income Taxes
We recognize deferred tax assets and liabilities for the future tax consequences attributable to temporary differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. A valuation allowance is established for any portion of deferred tax assets that are not considered more likely than not to be realized. We evaluate all available positive and negative evidence, including our forecast of future taxable income, to assess the need for a valuation allowance on our deferred tax assets.
We record a liability for unrecognized tax benefits from uncertain tax positions taken, or expected to be taken, in our tax returns. We follow a two-step approach to recognizing and measuring uncertain tax positions. The first step is to evaluate the tax position for recognition by determining if the available evidence indicates it is more likely than not that the position will be sustained on audit, including resolution of related appeals or litigation processes, if any. The second step is to measure the tax benefit as the largest amount which is more than 50% likely of being realized upon ultimate settlement. We consider many factors when evaluating and estimating our tax positions and tax benefits, which may require periodic adjustments, and may not accurately forecast actual outcomes.
We classify net interest and penalties on tax uncertainties as a component of income tax expense in our consolidated statements of operations.
Net Income Per Share
We calculate basic net income per share by dividing net income by the weighted-average number of common shares outstanding during the period. We calculate diluted net income per share based on the weighted-average number of common shares outstanding adjusted by the number of potentially dilutive common shares as determined by the treasury stock method. Potentially dilutive shares consist of stock options and restricted stock awards.
Sources of Supply
We currently obtain materials and components used to produce our beds from outside sources. As a result, we are dependent upon suppliers that in some instances, are our sole source of supply. We are continuing our efforts to dual-source key components. The failure of one or more of our suppliers to provide us with materials or components on a timely basis could significantly impact our consolidated results of operations and net income per share. We believe we can obtain these raw materials and components from other sources of supply in the ordinary course of business, although an unexpected loss of supply over a short period of time may not allow us to replace these sources in the ordinary course of business.
New Accounting Pronouncements
In May 2014, the Financial Accounting Standards Board issued a comprehensive new revenue recognition model that requires a company to recognize revenue to depict the transfer of goods or services to a customer at an amount that reflects the consideration it expects to receive in exchange for those goods or services. This new guidance is effective for annual reporting periods beginning after December 15, 2016 and early adoption is not permitted. Accordingly, we will adopt this new guidance beginning in fiscal 2017. Companies may use either a full retrospective or a modified retrospective approach to adopt this new guidance and management is currently evaluating which transition approach to use. We are evaluating the effect of the new standard on our consolidated financial statements and related disclosures, and have not yet selected a transition method.

Fair_Value_Measurements_Notes

Fair Value Measurements (Notes)	12 Months Ended
	Jan. 03, 2015
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements
	The following tables set forth by level within the fair value hierarchy, our financial assets that were accounted for at fair value on a recurring basis, according to the valuation techniques we used to determine their fair value (in thousands):
		January 3, 2015
		Level 1		Level 2		Level 3		Total
	Marketable debt securities – current
	U.S. Treasury securities	$	17,506	$	—	$	—	$	17,506
	Corporate bonds	—		20,139		—		20,139
	U.S. Agency bonds	—		12,525		—		12,525
	Municipal bonds	—		6,953		—		6,953
	Commercial paper	—		12,486		—		12,486
		17,506		52,103		—		69,609
	Marketable debt securities – non-current
	U.S. Treasury securities	14,990		—		—		14,990
	Corporate bonds	—		15,236		—		15,236
	U.S. Agency bonds	—		10,014		—		10,014
	Municipal bonds	—		4,201		—		4,201
		14,990		29,451		—		44,441
		$	32,496	$	81,554	$	—	$	114,050
		December 28, 2013
		Level 1		Level 2		Level 3		Total
	Marketable debt securities – current
	U.S. Treasury securities	$	15,011	$	—	$	—	$	15,011
	Corporate bonds	—		20,300		—		20,300
	U.S. Agency bonds	—		12,025		—		12,025
	Municipal bonds	—		4,823		—		4,823
		15,011		37,148		—		52,159
	Marketable debt securities – non-current
	U.S. Treasury securities	8,978		—		—		8,978
	Corporate bonds	—		15,484		—		15,484
	U.S. Agency bonds	—		7,498		—		7,498
	Municipal bonds	—		2,672		—		2,672
		8,978		25,654		—		34,632
		$	23,989	$	62,802	$	—	$	86,791
	We did not have any transfers between Level 1 and Level 2 fair value measurements during the periods presented.
	At January 3, 2015, and December 28, 2013, we had $1.0 million and $1.1 million, respectively, of debt and equity securities that fund our deferred compensation plan and are classified in other assets. We also had corresponding deferred compensation plan liabilities of $1.0 million and $1.1 million at January 3, 2015, and December 28, 2013, respectively, which are included in other long-term liabilities. The majority of the debt and equity securities are Level 1 as they trade with sufficient frequency and volume to enable us to obtain pricing information on an ongoing basis. Unrealized gains/(losses) on the debt and equity securities offset those associated with the corresponding deferred compensation plan liabilities.

Purchase_of_Comfortaire_Notes

Purchase of Comfortaire (Notes)	12 Months Ended
	Jan. 03, 2015
Purchase of Comfortaire [Abstract]
Business Combination Disclosure [Text Block]	Purchase of Comfortaire
	On January 17, 2013, we completed the purchase of the business and assets of Comfortaire Corporation, a manufacturer and marketer of adjustable air-supported sleep systems. We purchased Comfortaire to advance our innovation leadership in individualized comfort. The acquisition price was $15.5 million. Comfortaire Corporation was a privately held company with 2012 net sales of $10.5 million. The purchase of Comfortaire's business and assets did not have a significant impact on our consolidated results of operations, cash flows or financial position.
	The following table summarizes the final fair value of the net assets acquired (in thousands):
	Accounts receivable	$	365
	Inventories	678
	Other assets	248
	Property and equipment	513
	Goodwill	6,113
	Intangible assets	8,638
	Total assets acquired	16,555
	Accounts payable	404
	Warranty liabilities	532
	Other liabilities	119
	Total liabilities acquired	1,055
	Net assets acquired	$	15,500
	The goodwill and identifiable intangible assets will be deductible for income tax purposes over a 15-year period on a straight-line basis.
	Identifiable intangible assets and the associated estimated useful lives are as follows (in thousands):
			Estimated
			Useful Life
	Developed technologies		10 years	$	4,829
	Customer relationships		7 years	2,413
	Trade name/trademarks		Indefinite-Lived	1,396
				$	8,638

Investments_Notes

Investments (Notes)	12 Months Ended
	Jan. 03, 2015
Investments [Abstract]
Investments	Investments
	Marketable Debt Securities
	Investments in marketable debt securities were comprised of the following (in thousands):
		January 3, 2015
		Amortized		Unrealized		Unrealized			Fair
		Cost		Gains		Losses			Value
	U.S. Treasury securities	$	32,507	$	12	$	(23	)	$	32,496
	Corporate bonds	35,409		2		(36		)	35,375
	U.S. Agency bonds	22,545		4		(10		)	22,539
	Municipal bonds	11,157		2		(5		)	11,154
	Commercial paper	12,487		—		(1		)	12,486
		$	114,105	$	20	$	(75	)	$	114,050
		December 28, 2013
		Amortized		Unrealized		Unrealized			Fair
		Cost		Gains		Losses			Value
	U.S. Treasury securities	$	23,975	$	15	$	(1	)	$	23,989
	Corporate bonds	35,804		3		(23		)	35,784
	U.S. Agency bonds	19,517		10		(4		)	19,523
	Municipal bonds	7,474		23		(2		)	7,495
		$	86,770	$	51	$	(30	)	$	86,791
	Maturities of marketable debt securities were as follows (in thousands):
		January 3, 2015				December 28, 2013
		Amortized		Fair		Amortized			Fair
		Cost		Value		Cost			Value
	Marketable debt securities – current (due in less than one year)	$	69,607	$	69,609	$	52,122		$	52,159
	Marketable debt securities – non-current (due in one to two years)	44,498		44,441		34,648			34,632
		$	114,105	$	114,050	$	86,770		$	86,791
	During 2014, 2013 and 2012, respectively, $54.2 million, $53.3 million and $26.0 million of marketable debt securities matured and were redeemed at face value. During 2014, there were no other-than-temporary declines in market value.
	Other Investments
	We have a minority equity investment in one of our strategic product-development partners. The carrying value of this investment at January 3, 2015 and December 28, 2013, using the cost method, is $6.0 million and $4.5 million, respectively, and is included in other assets on our consolidated balance sheet.

Inventories_Notes

Inventories (Notes)	12 Months Ended
	Jan. 03, 2015
Inventory Disclosure [Abstract]
Inventories	Inventories
	Inventories consisted of the following (in thousands):
		January 3,		December 28,
		2015		2013
	Raw materials	$	10,220	$	7,118
	Work in progress	411		505
	Finished goods	42,904		32,529
		$	53,535	$	40,152
	Our finished goods inventory, as of January 3, 2015, was comprised of $20.4 million of finished beds, including retail display beds and deliveries in-transit to those customers who have utilized home delivery services, $14.7 million of finished components that were ready for assembly for the completion of beds, and $7.8 million of retail accessories.
	Our finished goods inventory, as of December 28, 2013, was comprised of $13.4 million of finished beds, including retail display beds and deliveries in-transit to those customers who have utilized home delivery services, $11.3 million of finished components that were ready for assembly for the completion of beds, and $7.8 million of retail accessories.

Property_and_Equipment_Notes

Property and Equipment (Notes)	12 Months Ended
	Jan. 03, 2015
Property and Equipment [Abstract]
Property and Equipment[Text Block]	Property and Equipment
	Property and equipment consisted of the following (in thousands):
		January 3,			December 28,
		2015			2013
	Land	$	1,999		$	1,999
	Leasehold improvements	89,203			84,659
	Furniture and equipment	59,587			46,226
	Production machinery, computer equipment and software	122,913			106,072
	Property under capital lease	1,077			1,672
	Construction in progress	56,937			32,670
	Less: Accumulated depreciation and amortization	(166,263		)	(143,756		)
		$	165,453		$	129,542

Goodwill_and_Intangible_Assets

Goodwill and Intangible Assets (Notes)	12 Months Ended
	Jan. 03, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	Goodwill and Intangible Assets, Net
	Goodwill and Indefinite-Lived Intangible Assets
	The following is a roll forward of goodwill and indefinite-lived trade name/trademarks (in thousands):
			Twelve Months Ended						Twelve Months Ended
			January 3, 2015						December 28, 2013
			Goodwill			Indefinite-Lived			Goodwill			Indefinite-Lived
						Trade Name/						Trade Name/
						Trademarks						Trademarks
		Beginning balance	$	8,963		$	1,396		$	2,850		$	—
		Comfortaire purchase	—			—			6,113			1,396
		Ending balance	$	8,963		$	1,396		$	8,963		$	1,396
	Definite-Lived Intangible Assets
	The following table provides the gross carrying amount and related accumulated amortization of our definite-lived intangible assets (in thousands):
		January 3, 2015						December 28, 2013
		Gross Carrying			Accumulated			Gross Carrying			Accumulated
		Amount			Amortization			Amount			Amortization
	Developed technologies	$	5,231		$	1,342		$	5,231		$	850
	Customer relationships	2,413			675			2,413			330
	Trade names/trademarks	101			101			101			101
		$	7,745		$	2,118		$	7,745		$	1,281
	See Note 3, Purchase of Comfortaire, for details regarding our purchase of the business and assets of Comfortaire.

Leases_Notes

Leases (Notes)	12 Months Ended
	Jan. 03, 2015
Leases [Abstract]
Leases of Lessee Disclosure [Text Block]	Leases
	Rent expense was as follows (in thousands):
	Facility Rents:	2014		2013		2012
	Minimum rents	$	47,754	$	41,816	$	36,104
	Contingent rents	6,241		5,779		9,813
	Total	$	53,995	$	47,595	$	45,917
	Equipment Rents	$	3,609	$	2,694	$	2,627
	The aggregate minimum rental commitments under operating leases for subsequent years are as follows (in thousands):
	2015	$	48,366
	2016	44,813
	2017	39,188
	2018	28,236
	2019	18,679
	Thereafter	53,567
	Total future minimum lease payments	$	232,849

Debt_Notes

Debt (Notes)	12 Months Ended
	Jan. 03, 2015
Debt Disclosure [Abstract]
Debt	Credit Agreement
	Our $20.0 million Credit Agreement (the “Credit Agreement”) with Wells Fargo Bank, National Association, as amended, is an unsecured revolving credit facility that matures on August 31, 2016. The Credit Agreement contains an accordion feature that allows us to increase the amount of the line from $20 million to up to $50 million in total availability, subject to lender approval.
	Any borrowings under the Credit Agreement will, at our request, be classified as either LIBOR Loans or Adjusted Base Rate (“ABR”) Loans (both as defined in the Credit Agreement). The rate of interest payable by us in respect of loans outstanding under the revolving credit facility is (i) with respect to LIBOR Loans, the Adjusted LIBO Rate (as defined in the Credit Agreement) for the interest period then in effect, plus 1.25%; or (ii) with respect to ABR Loans, the ABR (as defined in the Credit Agreement) then in effect for the Daily One-Month LIBO Rate (as defined in the Credit Agreement), plus 1.50% or the prime rate. We are subject to certain financial covenants under the Credit Agreement, including minimum tangible net worth, a requirement to maintain a minimum amount of cash, cash equivalents and marketable debt securities, and to maintain at the administrative agent cash, cash equivalents and marketable debt securities equal to the amount the lenders are committed to lend under the Credit Agreement.
	At both January 3, 2015, and December 28, 2013, we had no borrowings and $20 million was available under the Credit Agreement. We had no outstanding letters of credit as of January 3, 2015 or December 28, 2013.

Shareholders_Equity_Notes

Shareholders' Equity (Notes)	12 Months Ended
	Jan. 03, 2015
Shareholders' Equity [Abstract]
Shareholders’ Equity	Shareholders’ Equity
	Stock-Based Compensation Expense
	Total stock-based compensation expense was as follows (in thousands):
			2014			2013				2012
	Stock options		$	2,125		$	2,698			$	3,688
	Stock awards		4,673			1,534				6,618
	Total stock-based compensation expense(1)(2)		6,798			4,232				10,306
	Income tax benefit		2,284			1,447				3,576
	Total stock-based compensation expense, net of tax		$	4,514		$	2,785			$	6,730
	(1) Includes $(0.5) million and $5.6 million of CEO transition (benefit) costs in 2013 and 2012, respectively. See CEO Transition Costs on page 57.
	(2) Reflects a $1.2 million benefit in 2014 related to a change in estimated forfeitures due to employee turnover.
	Stock Options
	A summary of our stock option activity was as follows (in thousands, except per share amounts and years):
			Stock		Weighted-				Weighted-		Aggregate
			Options		Average				Average		Intrinsic
					Exercise				Remaining		Value (1)
					Price per				Contractual
					Share				Term (years)
	Outstanding at December 28, 2013		1,754		$	15.77			5.6		$	11,812
	Granted		201		17.96
	Exercised		(244	)	12.15
	Canceled/Forfeited		(198	)	20.19
	Outstanding at January 3, 2015		1,513		$	16.06			5.6		$	16,642
	Exercisable at January 3, 2015		1,088		$	14.32			4.5		$	13,800
	Vested and expected to vest at January 3, 2015		1,455		$	15.86			5.5		$	16,279
	(1)	Aggregate intrinsic value includes only those options where the current share price is equal to or greater than the share price on the date of grant.
	Other information pertaining to options is as follows (in thousands, except per share amounts):
			2014			2013				2012
	Weighted-average grant date fair value of stock options granted		$	9.33		$	10.57			$	14.28
	Total intrinsic value (at exercise) of stock options exercised		$	2,478		$	7,726			$	12,724
	Cash received from the exercise of stock options for the fiscal year ended January 3, 2015 was $2.9 million. Our tax benefit related to the exercise of stock options for the fiscal year ended January 3, 2015 was $1.0 million.
	At January 3, 2015, there was $2.9 million of total stock option compensation expense related to non-vested stock options not yet recognized, which is expected to be recognized over a weighted-average period of 1.6 years.
	The assumptions used to calculate the fair value of options granted using the Black-Scholes-Merton option-pricing model were as follows:
	Valuation Assumptions		2014		2013			2012
	Expected dividend yield		0	%	0	%		0	%
	Expected volatility		58	%	61	%		63	%
	Risk-free interest rate		1.8	%	0.9	%		1.1	%
	Expected term (in years)		5.3		5.7			5.6
	Stock Awards
	Stock award activity was as follows (in thousands, except per share amounts):
			Time-		Weighted-Average			Performance- and			Weighted-Average
			Based		Grant Date			Market-Based			Grant Date
			Stock		Fair Value			Stock Awards			Fair Value
			Awards
	Outstanding at December 28, 2013		239		$18.86			461			$17.39
	Granted		319		17.96			409			17.75
	Vested		(60	)	13.3			(130	)		9.05
	Canceled/Forfeited		(26	)	18.04			(110	)		18.23
	Outstanding at January 3, 2015		472		$19.00			630			$18.61
	At January 3, 2015, there was $4.4 million of unrecognized compensation expense related to non-vested time-based stock awards, which is expected to be recognized over a weighted-average period of 2.0 years and $6.7 million of unrecognized compensation expense related to non-vested performance- and market-based stock awards, which is expected to be recognized over a weighted-average period of 2.1 years.
	During fiscal 2014, 126,550 market-based stock awards were granted and had a weighted-average grant date fair value of $14.90 per award. These stock awards are reflected in the "Performance- and Market-Based Stock Awards" column in the stock award activity table above. The assumptions used to calculate the fair value of the market-based stock awards using a Monte Carlo simulation model included an expected divided yield of 0%, expected volatility of 58% and a risk-free interest rate of 0.9%. No market-based stock awards were granted in fiscal 2013 or 2012.
	Repurchases of Common Stock
	Repurchases of our common stock were as follows (in thousands):
			2014			2013				2012
	Amount repurchased under Board-approved share repurchase program		$	45,044		$	40,037			$	30,023
	Amount repurchased in connection with the vesting of employee restricted stock grants		1,448			2,035				4,869
	Total amount repurchased		$	46,492		$	42,072			$	34,892
	As of January 3, 2015, the remaining authorization under our Board-approved share repurchase program was $235 million. There is no expiration date governing the period over which we can repurchase shares. Any repurchased shares are constructively retired and returned to an unissued status. The cost of stock repurchases is first charged to additional paid-in-capital. Once additional paid-in capital is reduced to zero, any additional amounts are charged to retained earnings.
	CEO Transition Costs
	In February 2012, we announced that William R. McLaughlin, then President and Chief Executive Officer, would retire from the Company effective June 1, 2012. In recognition of Mr. McLaughlin’s contributions, the Company’s Compensation Committee approved the modification of Mr. McLaughlin’s unvested stock awards, including performance stock awards. As a result of these modifications, we recorded incremental non-cash compensation of $5.6 million ($3.7 million, net of income tax) in 2012. The performance stock awards are subject to applicable performance adjustments through 2014 based on actual performance versus performance targets. During 2013, we recorded a non-cash compensation benefit of $0.5 million ($0.4 million, net of income tax) resulting from performance-based stock award adjustments. There were no performance-based stock award adjustments in 2014.
	Net Income per Common Share
	The components of basic and diluted net income per share are as follows (in thousands, except per share amounts):
		2014			2013				2012
	Net income	$	67,974		$	60,081			$	78,094
Reconciliation of weighted-average shares outstanding:
Basic weighted-average shares outstanding	53,452			54,866				55,516
Effect of dilutive securities:
Options	387			554				1,059
Restricted shares	354			383				501
Diluted weighted-average shares outstanding	54,193			55,803				57,076
Net income per share – basic	$	1.27		$	1.1			$	1.41
Net income per share – diluted	$	1.25		$	1.08			$	1.37
Additional potential dilutive stock options totaling 0.8 million, 1.3 million and 0.3 million for 2014, 2013 and 2012, respectively, have been excluded from our diluted net income per share calculations because these securities’ exercise prices were anti-dilutive (e.g., greater than the average market price of our common stock).

Other_Income_Expense_Net_Notes

Other Income (Expense), Net (Notes)	12 Months Ended
	Jan. 03, 2015
Other Income and Expenses [Abstract]
Other Expense, Net	Other Income, Net
	Other income, net, consisted of the following (in thousands):
		2014			2013			2012
	Interest income	$	415		$	375		310
	Interest expense	(53		)	(52		)	(92		)
	Other income, net	$	362		$	323		$	218

Income_Taxes_Notes

Income Taxes (Notes)	12 Months Ended
	Jan. 03, 2015
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes
	Income tax expense consisted of the following (in thousands):
	Current:	2014				2013				2012
	Federal	$	29,484			$	25,091			$	34,993
	State	4,161				3,802				3,419
		33,645				28,893				38,412
	Deferred:
	Federal	747				1,953				2,176
	State	(258		)		84				1,323
		489				2,037				3,499
	Income tax expense	$	34,134			$	30,930			$	41,911
	The following table provides a reconciliation between the statutory federal income tax rate and our effective income tax rate:
		2014			2013			2012
	Statutory federal income tax	35	%		35	%		35	%
	State income taxes, net of federal benefit	2.5			3			2.9
	Manufacturing deduction	(3.3	)		(3.2	)		(3.1	)
	Changes in unrecognized tax benefits	0.3			0.3			(0.2	)
	Other	(1.1	)		(1.1	)		0.3
	Effective income tax rate	33.4	%		34	%		34.9	%
	We file income tax returns with the U.S. federal government and various state jurisdictions. In the normal course of business, we are subject to examination by federal and state taxing authorities. We are no longer subject to federal income tax examinations for years prior to 2011 or state income tax examinations prior to 2010.
	Deferred Income Taxes
	The tax effects of temporary differences that give rise to deferred income taxes were as follows (in thousands):
	Deferred tax assets:	2014				2013
	Current:
	Warranty and returns liabilities	$	5,753			$	4,376
	Compensation and benefits	1,545				1,379
	Deferred rent and lease incentives	991				857
	Other	709				539
	Long-term:
	Stock-based compensation	6,843				5,944
	Deferred rent and lease incentives	5,527				4,524
	Warranty liabilities	1,051				605
	Net operating loss and capital loss carryforwards	649				827
	Other	—				1,111
	Total gross deferred tax assets	23,068				20,162
	Valuation allowance	(552		)		(587		)
	Total deferred tax assets after valuation allowance	22,516				19,575
	Deferred tax liabilities:
	Long-term:
	Property and equipment	9,873				7,696
	Other	424				—
	Total gross deferred tax liabilities	10,297				7,696
	Net deferred tax assets	$	12,219			$	11,879
	At January 3, 2015, we had net operating loss carryforwards for state income tax purposes of $2.3 million, which will expire between 2023 and 2034.
	We evaluate our deferred income taxes quarterly to determine if valuation allowances are required. As part of this evaluation, we assess whether valuation allowances should be established for any deferred tax assets that are not considered more likely than not to be realized, using all available evidence, both positive and negative. This assessment considers, among other matters, the nature, frequency, and severity of historical losses, forecasts of future profitability, taxable income in available carryback periods and tax planning strategies. In making such judgments, significant weight is given to evidence that can be objectively verified.
	Unrecognized Tax Benefits - there were no significant unrecognized tax benefits, penalties or interest related to current-year or prior-year tax positions.

Profit_Sharing_and_401K_Plan_N

Profit Sharing and 401(K) Plan (Notes)	12 Months Ended
	Jan. 03, 2015
Profit Sharing and 401 (k) Plan [Abstract]
Pension and Other Postretirement Benefits Disclosure [Text Block]	Profit Sharing and 401(k) Plan
	Under our profit sharing and 401(k) plan, eligible employees may defer up to 50% of their compensation on a pre-tax basis, subject to Internal Revenue Service limitations. Each year, we may make a discretionary contribution equal to a percentage of the employee’s contribution. During 2014, 2013 and 2012, our contributions, net of forfeitures, were $3.7 million, $3.0 million and $2.5 million, respectively.

Commitments_and_Contingencies_

Commitments and Contingencies (Notes)	12 Months Ended
	Jan. 03, 2015
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies
	Legal Proceedings
	We are involved from time to time in various legal proceedings arising in the ordinary course of our business, including primarily commercial, product liability, employment and intellectual property claims. In accordance with generally accepted accounting principles in the United States, we record a liability in our consolidated financial statements with respect to any of these matters when it is both probable that a liability has been incurred and the amount of the liability can be reasonably estimated. With respect to currently pending legal proceedings, we have not established an estimated range of reasonably possible additional losses either because we believe that we have valid defenses to claims asserted against us or the proceeding has not advanced to a stage of discovery that would enable us to establish an estimate. We currently do not expect the outcome of these matters to have a material effect on our consolidated results of operations, financial position or cash flows. Litigation, however, is inherently unpredictable, and it is possible that the ultimate outcome of one or more claims asserted against us could adversely impact our results of operations, financial position or cash flows. We expense legal costs as incurred.
	On August 23, 2013, we filed a complaint in U.S. District Court in the District of Minnesota against Gentherm, Inc. seeking a declaratory judgment that Select Comfort be named as an assignee of certain patents asserted against Select Comfort by Gentherm or in the alternative that the asserted patents are not enforceable or are invalid or that Select Comfort and its products do not infringe any valid claim of the asserted patents. This complaint was filed after Gentherm asserted in a letter that Select Comfort’s recently introduced DualTemp™ layer product infringed certain patents owned by Gentherm. Subsequently, Gentherm filed counterclaims alleging infringement of its patents and seeking various legal and equitable remedies, including injunctive relief, treble damages and attorney’s fees. We believe the claims asserted by Gentherm are without merit, and we intend to vigorously pursue our claims and defend the claims asserted by Gentherm.
	Consumer Credit Arrangements
	We refer customers seeking extended financing to certain third party financiers (“Card Servicers”). The Card Servicers, if credit is granted, establish the interest rates, fees, and all other terms and conditions of the customer’s account based on their evaluation of the creditworthiness of the customer. As the receivables are owned by the Card Servicers, at no time are the receivables purchased or acquired from us. We are not liable to the Card Servicers for our customers’ credit defaults.
	Commitments
	As of January 3, 2015, we had $7.5 million of inventory purchase commitments with our suppliers as part of the normal course of business. There are a limited number of supply contracts that contain penalty provisions for failure to purchase contracted quantities. We do not currently expect any payments under these provisions. At January 3, 2015, we had entered into 10 lease commitments for future retail store locations. These lease commitments provide for minimum rentals over the next five to ten years, which if consummated based on current cost estimates, would approximate $14.0 million over the initial lease term. The minimum rentals for these lease commitments have been included in the future minimum lease payments in Note 8, Leases.

Summary_of_Quarterly_Financial

Summary of Quarterly Financial Data (unaudited) (Notes)	12 Months Ended
	Jan. 03, 2015
Summary of Quarterly Financial Data (unaudited) [Abstract]
Quarterly Financial Information [Text Block]	Summary of Quarterly Financial Data (unaudited)
	The following is a condensed summary of our quarterly results (in thousands, except net income per share amounts). Quarterly diluted net income per share amounts may not total to the respective annual amount due to changes in weighted-average shares outstanding during the year.
	2014	First		Second		Third		Fourth		Fiscal
										Year
	Net sales	$	276,412	$	234,763	$	323,366	$	322,216	$	1,156,757
	Gross profit	171,383		142,397		198,584		194,486		706,850
	Operating income	25,802		12,711		35,346		27,887		101,746
	Net income	16,992		8,481		23,554		18,947		67,974
	Net income per share – diluted	0.31		0.16		0.44		0.35		1.25
	2013	First		Second		Third		Fourth		Fiscal
										Year
	Net sales	$	258,237	$	207,391	$	263,689	$	230,854	$	960,171
	Gross profit	163,416		131,398		166,420		140,521		601,755
	Operating income	35,227		15,107		30,699		9,655		90,688
	Net income	23,471		9,926		20,259		6,425		60,081
	Net income per share – diluted	0.42		0.18		0.36		0.12		1.08

Schedule_II_Valuation_and_Qual

Schedule II - Valuation and Qualifying Accounts	12 Months Ended
	Jan. 03, 2015
Valuation and Qualifying Accounts [Abstract]
Schedule II - Valuation and Qualifying Accounts	SELECT COMFORT CORPORATION AND SUBSIDIARIES
	Schedule II - Valuation and Qualifying Accounts
	(in thousands)
	Description	2014			2013			2012
	Allowance for doubtful accounts
	Balance at beginning of period	$	425		$	348		$	397
	Additions charged to costs and expenses	729			776			246
	Deductions from reserves	(415		)	(699		)	(295		)
	Balance at end of period	$	739		$	425		$	348
	Accrued sales returns
	Balance at beginning of period	$	9,433		$	5,330		$	4,402
	Additions charged to costs and expenses	78,890			59,656			44,284
	Deductions from reserves	(73,061		)	(55,553		)	(43,356		)
	Balance at end of period	$	15,262		$	9,433		$	5,330

Business_and_Summary_of_Signif1

Business and Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Jan. 03, 2015
Accounting Policies [Abstract]
Business and Basis of Presentation [Text Block]	Business & Basis of Presentation
	Select Comfort Corporation and our 100%-owned subsidiaries (“Select Comfort” or the “Company”) are the exclusive designer, manufacturer, marketer, retailer and servicer of a complete line of Sleep Number® beds. Only the Sleep Number bed offers SleepIQ® technology - proprietary sensor technology that works directly with the bed’s DualAir™ technology to monitor each individual’s sleep. Sleep Number also offers a full line of exclusive sleep products, including FlextFit™ adjustable base technology, Sleep Number® pillows, sheets and other bedding products.
	As the only national specialty-mattress retailer, we generate revenue by selling products through two distribution channels. Our Company-Controlled channel, which includes Retail, Direct Marketing and E-Commerce, sells directly to consumers. Our Wholesale/Other channel sells to and through selected retail and wholesale customers in the United States and Australia, and the QVC shopping channel. The consolidated financial statements include the accounts of Select Comfort Corporation and our subsidiaries. All significant intra-entity balances and transactions have been eliminated in consolidation.
Fiscal Year [Policy Text Block]	Fiscal Year
	Our fiscal year ends on the Saturday closest to December 31. Fiscal years and their respective fiscal year ends were as follows: fiscal 2014 ended January 3, 2015; fiscal 2013 ended December 28, 2013; and fiscal 2012 ended December 29, 2012. Fiscal year 2014 had 53 weeks and fiscal years 2013 and 2012 each had 52 weeks.
Use of Estimates in the Preparation of Financial Statements [Policy Text Block]	Use of Estimates in the Preparation of Financial Statements
	The preparation of consolidated financial statements in conformity with U.S. generally accepted accounting principles (“GAAP”) requires us to make estimates and assumptions. These estimates and assumptions affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the consolidated financial statements, and the reported amounts of sales, expenses and income taxes during the reporting period. Predicting future events is inherently an imprecise activity and, as such, requires the use of judgment. As future events and their effects cannot be determined with precision, actual results could differ significantly from these estimates. Changes in these estimates will be reflected in the financial statements in future periods. Our critical accounting policies consist of stock-based compensation, goodwill and indefinite-lived intangible assets, warranty liabilities and revenue recognition.
Cash and Cash Equivalents [Policy Text Block]	Cash and Cash Equivalents
	Cash and cash equivalents include highly liquid investments with original maturities of three months or less. The carrying value of these investments approximates fair value due to their short-term maturity. Our banking arrangements allow us to fund outstanding checks when presented to the financial institution for payment, resulting in book overdrafts. Book overdrafts are included in accounts payable in our consolidated balance sheets and in net increase (decrease) in short-term borrowings in the financing activities section of our consolidated statements of cash flows.
Marketable Debt Securities[Policy Text Block]	Marketable Debt Securities
	Our investment portfolio is currently comprised of U.S. government and agency securities, corporate debt securities, municipal bonds and commercial paper. The value of these securities is subject to market and credit volatility during the period these investments are held. We classify marketable debt securities as available-for-sale investments and these securities are stated at their estimated fair value. Our investments with original maturities of greater than three months but current maturities of less than one year are recorded as marketable debt securities – current. Our investments with current maturities of more than one year are recorded as marketable debt securities – non-current. Unrealized gains and losses, net of income tax, are reported as a component of accumulated other comprehensive (loss) income in our consolidated balance sheets. Other-than-temporary declines in market value, if any, from original cost are charged to other income, net in the consolidated statements of operations in the period in which the loss occurs, and a new cost basis for the security is established. In determining whether an other-than-temporary decline in the market value has occurred, we consider the duration and extent that the fair value of the investment is below its cost. Realized gains and losses, if any, are calculated on the specific identification method and are measured and reclassified from accumulated other comprehensive (loss) income in our consolidated balance sheets to other income, net in our consolidated statements of operations.
Concentration of Credit Risk [Policy Text Block]	Concentration of Credit Risk
	Our investment policy’s primary focus is to preserve principal and maintain adequate liquidity. Our investment policy addresses the concentration of credit risk by limiting the concentration in certain investment types. Our exposure to a concentration of credit risk consists primarily of cash, cash equivalents and investments. We place our cash with high-credit quality issuers. We currently hold investments in U.S. government and agency securities, corporate debt securities, municipal bonds and commercial paper. We believe no significant concentration of credit risk exists with respect to our cash, cash equivalents and investments.
Accounts Receivable [Policy Text Block]	Accounts Receivable
	Accounts receivable are recorded net of an allowance for expected losses and consist primarily of receivables from wholesale customers and receivables from third-party financiers for customer credit card purchases. The allowance is recognized in an amount equal to anticipated future write-offs. We estimate future write-offs based on delinquencies, aging trends, industry risk trends and our historical experience. Account balances are charged off against the allowance when we believe it is probable the receivable will not be recovered.
Inventories [Policy Text Block]	Inventories
	Inventories include materials, labor and overhead and are stated at the lower of cost or market. Cost is determined by the first-in, first-out method.
Property and Equipment [Policy Text Block]	Property and Equipment
	Property and equipment, carried at cost, is depreciated using the straight-line method over the estimated useful lives of the assets. The cost and related accumulated depreciation of assets sold or retired is removed from the accounts with any resulting gain or loss included in net income in our consolidated statements of operations. Maintenance and repairs are charged to expense as incurred. Major renewals and betterments that extend useful life are capitalized.
	Leasehold improvements are depreciated over the shorter of the estimated useful lives of the assets or the contractual term of the lease, with consideration of lease renewal options if renewal appears probable.
	Property under capital lease is comprised of computer equipment and computer software used in our retail operations and corporate support areas.
	Estimated useful lives of our property and equipment by major asset category are as follows:
	Leasehold improvements	5 to 10 years
	Furniture and equipment	5 to 7 years
	Production machinery, computer equipment and software	3 to 7 years
	Property under capital lease	3 to 4 years
Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block]	Goodwill and Intangible Assets, Net
	Goodwill is the difference between the purchase price of a company and the fair market value of the acquired company's net identifiable assets.
Goodwill and Intangible Assets, Intangible Assets, Policy [Policy Text Block]	Our intangible assets include developed technologies, trade names/trademarks and customer relationships. Definite-lived intangible assets are being amortized using the straight-line method over their estimated lives, ranging from 7-17 years.
Asset Impairment Charges [Policy Text Block]	Asset Impairment Charges
	Long-lived Assets and Definite-lived Intangible Assets - we review our long-lived assets and definite-lived intangible assets for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. When evaluating long-lived assets for potential impairment, we first compare the carrying value of the asset to the estimated future cash flows (undiscounted and without interest charges - plus proceeds expected from disposition, if any). If the estimated undiscounted cash flows are less than the carrying value of the asset, we calculate an impairment loss. The impairment loss calculation compares the carrying value of the asset to the asset’s estimated fair value. When we recognize an impairment loss, the carrying amount of the asset is reduced to estimated fair value based on discounted cash flows, quoted market prices or other valuation techniques. Assets to be disposed of are reported at the lower of the carrying amount of the asset or fair value less costs to sell. We review retail store assets for potential impairment based on historical cash flows, lease termination provisions and expected future retail store operating results. If we recognize an impairment loss for a depreciable long-lived asset, the adjusted carrying amount of the asset becomes its new cost basis and will be depreciated (amortized) over the remaining useful life of that asset.
	Goodwill and Indefinite-lived Intangible Assets - goodwill and indefinite-lived intangible assets are not amortized, but are tested for impairment annually or when there are indicators of impairment using a fair value approach. Our test for goodwill impairment is performed at least annually or when there are any indicators of impairment. The Financial Accounting Standards Board's (FASB) guidance allows us to perform either a quantitative assessment or a qualitative assessment before calculating the fair value of a reporting unit. We have elected to perform the quantitative assessment. The quantitative goodwill impairment test is a two-step process. The first step is a comparison of the fair value of the reporting unit with its carrying amount, including goodwill. If this step reflects impairment, then the loss would be measured as the excess of recorded goodwill over its implied fair value. Implied fair value is the excess of fair value of the reporting unit over the fair value of all identified assets and liabilities. Fair value is determined using a market-based approach utilizing widely accepted valuation techniques, including quoted market prices and our market capitalization. Based on our 2014 quantitative assessment, we determined there was no impairment. Other indefinite-lived intangible assets are assessed for impairment at least annually, or when there are any indicators of impairment, by comparing the carrying value of an asset with its fair value. If the carrying value exceeds fair value, an impairment loss is recognized in an amount equal to the excess.
Warranty Liabilities [Policy Text Block]	Warranty Liabilities
	We provide a limited warranty on most of the products we sell. The estimated warranty costs, which are expensed at the time of sale and included in cost of sales, are based on historical trends and warranty claim rates incurred by us and are adjusted for any current trends as appropriate. Actual warranty claim costs could differ from these estimates. We regularly assess and adjust the estimate of accrued warranty claims by updating claims rates for actual trends and projected claim costs.
	We classify as non-current those estimated warranty costs expected to be paid out in greater than one year.
Fair Value Measurements [Policy Text Block]	Fair Value Measurements
	The guidance for fair value measurements establishes the authoritative definition of fair value, sets out a framework for measuring fair value and outlines the required disclosures regarding fair value measurements. Fair value is the price that would be received to sell an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants at the measurement date. We use a three-tier fair value hierarchy based upon observable and unobservable inputs as follows:
	•	Level 1 – observable inputs such as quoted prices in active markets;
	•	Level 2 – inputs, other than the quoted prices in active markets, that are observable either directly or indirectly including:
	◦Quoted prices for similar assets or liabilities in active markets;
	◦Quoted prices for identical or similar assets in nonactive markets;
	◦Inputs other than quoted prices that are observable for the asset or liability;
	◦Inputs that are derived principally from or corroborated by other observable market data; and
	•	Level 3 – unobservable inputs in which there is little or no market data, which require the reporting entity to develop its own assumptions.
	We generally estimate fair value of long-lived assets, including our retail stores, using the income approach, which we base on estimated future cash flows (discounted and with interest charges). The inputs used to determine fair value relate primarily to future assumptions regarding sales volumes, gross profit rates, retail store operating expenses and applicable probability weightings regarding future alternative uses. These inputs are categorized as Level 3 inputs under the fair value measurements guidance. The inputs used represent management’s assumptions about what information market participants would use in pricing the assets and are based upon the best information available at the balance sheet date.
	The fair value hierarchy requires the use of observable market data when available. In instances in which the inputs used to measure fair value fall into different levels of the fair value hierarchy, the fair value measurement has been determined based on the lowest level input that is significant to the fair value measurement in its entirety. Our assessment of the significance of a particular item to the fair value measurement in its entirety requires judgment, including the consideration of inputs specific to the asset or liability. Our financial assets are valued using market prices based on either active markets (Level 1 measurements) or less active markets (Level 2 measurements).
	Our Level 1 securities include U.S. Treasury securities as they trade with sufficient frequency and volume to enable us to obtain pricing information on a consistent basis. Our Level 2 securities include U.S. Agency bonds, corporate bonds, municipal bonds and commercial paper whose value is determined by a third-party pricing service using inputs that are observable in the market or can be derived principally from or corroborated by observable market data such as pricing for similar securities, recently executed transactions, cash flow models with yield curves and benchmark securities.
Dividends [Policy Text Block]	Dividends
	We are not restricted from paying cash dividends under our credit agreement other than customary legal and contractual restrictions. However, we have not historically paid, and have no current plans to pay, cash dividends on our common stock.
Revenue Recognition [Policy Text Block]	Revenue Recognition
	Revenue is recognized when the sales price is fixed or determinable, collectability is reasonably assured and title passes. Amounts billed to customers for delivery and setup are included in net sales. Revenue is reported net of estimated sales returns and excludes sales taxes.
	We accept sales returns after a 100-night trial period. The accrued sales returns estimate is based on historical return rates and is adjusted for any current trends as appropriate. If actual returns vary from expected rates, sales in future periods are adjusted.
	In fiscal 2014, we introduced our SleepIQ® technology. The SleepIQ® system is a multiple-element arrangement with deliverables that include a bed, hardware and software. We analyze our multiple-element arrangement(s) to determine whether the deliverables can be separated or whether they must be accounted for as a single unit of accounting. We determined that the SleepIQ system has two units of accounting consisting of: (i) the bed; and (ii) the hardware/software. The hardware and software are not separable as the hardware and related software are not sold separately and the software is integral to the hardware’s functionality. We valued the two units of accounting based on their relative selling prices.
	At January 3, 2015, we had deferred revenue totaling $9.4 million, of which $2.0 million and $7.4 million is included in other current liabilities and other long-term liabilities, respectively, in our consolidated balance sheet. We also have related deferred costs totaling $5.9 million, of which $1.2 million and $4.7 million is included in other current assets and other assets, respectively, in our consolidated balance sheet. There were no deferred revenue or costs at December 28, 2013. The deferred revenue and costs are recognized over the product’s estimated life of five years.
Cost of Sales, Sales and Marketing, General and Administrative [Policy Text Block]	Cost of Sales, Sales and Marketing, General and Administrative (“G&A”) and Research & Development (“R&D”) Expenses
	The following tables summarize the primary costs classified in each major expense category (the classification of which may vary within our industry):
	Cost of Sales		Sales & Marketing
	•  Costs associated with purchasing, manufacturing, shipping, handling and delivering our products to our retail stores and customers;		•  Advertising and media production;
	•  Physical inventory losses, scrap and obsolescence;		•  Marketing and selling materials such as brochures, videos, customer mailings and in-store signage;
	•  Related occupancy and depreciation expenses;		•  Payroll and benefits for sales and customer service staff;
	•  Costs associated with returns and exchanges; and		•  Store occupancy costs;
	•  Estimated costs to service warranty claims of customers.		•  Store depreciation expense;
			•  Credit card processing fees; and
			•  Promotional financing costs.
	G&A		R&D(1)
	•  Payroll and benefit costs for corporate employees, including information technology, legal, human resources, finance, sales and marketing administration, investor relations and risk management;		•  Internal labor and benefits related to research and development activities;
	•   Occupancy costs of corporate facilities;		•  Outside consulting services related to research and development activities; and
	•   Depreciation related to corporate assets;		•  Testing equipment related to research and development activities.
	•   Information hardware, software and maintenance;
	•   Insurance;		(1) Costs incurred in connection with R&D are charged to expense as incurred.
	•   Investor relations costs; and
	•   Other overhead costs.
Operating Leases [Policy Text Block]	Operating Leases
	We lease our retail, office and manufacturing space under operating leases which, in addition to the minimum lease payments, may require payment of a proportionate share of the real estate taxes and certain building operating expenses. Our retail store leases generally provide for an initial lease term of five to ten years with a termination option if we do not achieve certain minimum annual sales thresholds. In addition, our mall-based retail store leases may require payment of contingent rent based on net sales in excess of certain thresholds. Certain retail store leases may contain options to extend the term of the original lease.
	Minimum rent expense, which excludes contingent rents, is recognized on a straight-line basis over the lease term, after consideration of rent escalations and rent holidays. We record any difference between the straight-line rent amounts and amounts payable under the leases as part of deferred rent, in other current liabilities or other long-term liabilities, as appropriate. The lease term for purposes of the calculation begins on the earlier of the lease commencement date or the date we take possession of the property. During lease renewal negotiations that extend beyond the original lease term, we estimate straight-line rent expense based on current market conditions. At January 3, 2015, and December 28, 2013, deferred rent included in other current liabilities in our consolidated balance sheets was $0.3 million and $0.5 million, respectively, and deferred rent included in other long-term liabilities in our consolidated balance sheets was $6.5 million and $5.5 million, respectively. Contingent rent expense is recorded when it is probable the expense has been incurred and the amount is reasonably estimable. Future payments for real estate taxes and certain building operating expenses for which we are obligated are not included in minimum lease payments.
	Leasehold improvements that are funded by landlord incentives or allowances under an operating lease are recorded as deferred lease incentives, in other current liabilities or other long-term liabilities, as appropriate and amortized as reductions to rent expense over the lease term. At January 3, 2015, and December 28, 2013, deferred lease incentives included in other current liabilities in our consolidated balance sheets were $2.6 million and $2.0 million, respectively, and deferred lease incentives included in other long-term liabilities in our consolidated balance sheets were $8.4 million and $7.2 million, respectively.
Pre-opening Costs [Policy Text Block]	Pre-Opening Costs
	Costs associated with the start-up and promotion of new retail store openings are expensed as incurred.
Advertising Costs [Policy Text Block]	Advertising Costs
	We incur advertising costs associated with print, digital and broadcast advertisements. Advertising costs are charged to expense when the ad first runs.
Insurance [Policy Text Block]	Insurance
	We are self-insured for certain losses related to health and workers’ compensation claims, although we obtain third-party insurance coverage to limit exposure to these claims. We estimate our self-insured liabilities using a number of factors including historical claims experience and analysis of incurred but not reported claims.
Internal Use Software, Policy [Policy Text Block]	Software Capitalization
	For software developed or obtained for internal use, we capitalize direct external costs associated with developing or obtaining internal-use software. In addition, we also capitalize certain payroll and payroll-related costs for employees who are directly involved with the development of such applications. Capitalized costs related to internal-use software under development are treated as construction-in-progress until the program, feature or functionality is ready for its intended use, at which time depreciation commences. We expense any data conversion or training costs as incurred.
Stock-based Compensation [Policy Text Block]	Stock-Based Compensation
	We compensate officers, directors and key employees with stock-based compensation under two stock plans approved by our shareholders in 2004 and 2010 and administered under the supervision of our Board of Directors (“Board”). At January 3, 2015, a total of 4.8 million shares were available for future grant under the 2010 stock plan. These plans include non-qualified stock options and stock awards.
	We record stock-based compensation expense based on the award’s fair value at the grant date and the awards that are expected to vest. We recognize stock-based compensation expense over the period during which an employee is required to provide services in exchange for the award. We reduce compensation expense by estimated forfeitures. Forfeitures are estimated using historical experience and projected employee turnover. We include as part of cash flows from financing activities the benefit of tax deductions in excess of recognized stock-based compensation expense.
	Stock Options - stock option awards are granted at exercise prices equal to the closing price of our stock on the grant date. Generally, options vest proportionally over periods of two to four years and expire after 10 years. Compensation expense is recognized ratably over the vesting period.
	We determine the fair value of stock options granted and the resulting compensation expense at the date-of-grant using the Black-Scholes-Merton option-pricing model and a single option award approach. Descriptions of significant assumptions used to estimate the expected volatility, risk-free interest rate and expected term are as follows:
	Expected Volatility – Expected volatility was determined based on implied volatility of our traded options and historical volatility of our stock price.
	Risk-Free Interest Rate – The risk-free interest rate was based on the implied yield available on U.S. Treasury zero-coupon issues at the date of grant with a term equal to the expected term.
	Expected Term – Expected term represents the period that our stock-based awards are expected to be outstanding and was determined based on historical experience and anticipated future exercise patterns, giving consideration to the contractual terms of unexercised stock-based awards.
	Stock Awards - we issue stock awards to certain employees in conjunction with our stock-based compensation plan. The stock awards generally vest from two to four years based on continued employment (“time based”). Compensation expense related to stock awards, except for stock awards with a market condition, is determined on the grant date based on the publicly quoted closing price of our common stock and is charged to earnings on a straight-line basis over the vesting period. Stock awards with a market condition are valued using a Monte Carlo simulation model. The significant assumptions used to estimate the expected volatility and risk-free interest rate are similar to those described above in Stock Options.
	Certain time-based stock awards have either a performance condition ("performance-based") or a market condition ("market-based").
	Performance-based Stock Awards – the final number of shares earned and the related compensation expense is adjusted up or down to the extent the performance target is met as of the last day of the performance period. The actual number of shares that will ultimately be awarded range from 0% - 200% of the targeted amount for the 2014 and 2013 awards and from 0% to 150% of the targeted amount for the 2012 awards. We evaluate the likelihood of meeting the performance targets at each reporting period and adjust compensation expense, on a cumulative basis, based on the expected achievement of each of the performance targets. For performance-based stock awards granted in 2014, the performance targets are growth in net sales and in operating profit, and the performance period is fiscal 2014 through 2016. For performance-based stock awards granted in 2013, the performance targets are net sales and operating margin, and the performance period is fiscal 2015. For performance-based stock awards granted in 2012, the performance target is market share growth and the performance period is from fiscal 2012 through 2014. The market share growth calculation will be finalized in fiscal 2015 when an industry survey report is issued.
	Market-based Stock Awards – the related compensation expense is fixed, however, the final number of shares earned is adjusted to the extent that the market condition is achieved during the performance period. The actual number of shares that will ultimately be awarded range from 0% to 100% of the target amount for 2014 awards. For the market-based stock awards granted in 2014, the market condition was based on increases in our stock price for a specified number of sequential days and the performance period is three years beginning on the date of grant, which was March 28, 2014. As of January 3, 2015, the market condition had been achieved. There were no market-based stock awards granted in 2013 or 2012.
	See Note 10, Shareholders’ Equity, for additional information on stock-based compensation.
Share Repurchase Plan [Text Block]	There is no expiration date governing the period over which we can repurchase shares. Any repurchased shares are constructively retired and returned to an unissued status. The cost of stock repurchases is first charged to additional paid-in-capital. Once additional paid-in capital is reduced to zero, any additional amounts are charged to retained earnings.
Income Taxes [Policy Text Block]	Income Taxes
	We recognize deferred tax assets and liabilities for the future tax consequences attributable to temporary differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. A valuation allowance is established for any portion of deferred tax assets that are not considered more likely than not to be realized. We evaluate all available positive and negative evidence, including our forecast of future taxable income, to assess the need for a valuation allowance on our deferred tax assets.
	We record a liability for unrecognized tax benefits from uncertain tax positions taken, or expected to be taken, in our tax returns. We follow a two-step approach to recognizing and measuring uncertain tax positions. The first step is to evaluate the tax position for recognition by determining if the available evidence indicates it is more likely than not that the position will be sustained on audit, including resolution of related appeals or litigation processes, if any. The second step is to measure the tax benefit as the largest amount which is more than 50% likely of being realized upon ultimate settlement. We consider many factors when evaluating and estimating our tax positions and tax benefits, which may require periodic adjustments, and may not accurately forecast actual outcomes.
	We classify net interest and penalties on tax uncertainties as a component of income tax expense in our consolidated statements of operations.
Net Income Per Share [Policy Text Block]	Net Income Per Share
	We calculate basic net income per share by dividing net income by the weighted-average number of common shares outstanding during the period. We calculate diluted net income per share based on the weighted-average number of common shares outstanding adjusted by the number of potentially dilutive common shares as determined by the treasury stock method. Potentially dilutive shares consist of stock options and restricted stock awards.
Sources of Supply [Policy Text Block]	Sources of Supply
	We currently obtain materials and components used to produce our beds from outside sources. As a result, we are dependent upon suppliers that in some instances, are our sole source of supply. We are continuing our efforts to dual-source key components. The failure of one or more of our suppliers to provide us with materials or components on a timely basis could significantly impact our consolidated results of operations and net income per share. We believe we can obtain these raw materials and components from other sources of supply in the ordinary course of business, although an unexpected loss of supply over a short period of time may not allow us to replace these sources in the ordinary course of business.
New Accounting Pronouncements, Policy [Policy Text Block]	New Accounting Pronouncements
	In May 2014, the Financial Accounting Standards Board issued a comprehensive new revenue recognition model that requires a company to recognize revenue to depict the transfer of goods or services to a customer at an amount that reflects the consideration it expects to receive in exchange for those goods or services. This new guidance is effective for annual reporting periods beginning after December 15, 2016 and early adoption is not permitted. Accordingly, we will adopt this new guidance beginning in fiscal 2017. Companies may use either a full retrospective or a modified retrospective approach to adopt this new guidance and management is currently evaluating which transition approach to use. We are evaluating the effect of the new standard on our consolidated financial statements and related disclosures, and have not yet selected a transition method.

Business_and_Summary_of_Signif2

Business and Summary of Significant Accounting Policies Estimate Useful Life of Property and Equipment by Major Asset Category (Tables)	12 Months Ended
	Jan. 03, 2015
Estimated Useful Life of our Property, Plant and Equipment [Abstract]
Estimated Useful Lives Of Property And Equipment [Table Text Block]	Estimated useful lives of our property and equipment by major asset category are as follows:
	Leasehold improvements	5 to 10 years
	Furniture and equipment	5 to 7 years
	Production machinery, computer equipment and software	3 to 7 years
	Property under capital lease	3 to 4 years

Business_and_Summary_of_Signif3

Business and Summary of Significant Accounting Policies Warranty Liabilities (Tables)	12 Months Ended
	Jan. 03, 2015
Standard Product Warranty Disclosure [Abstract]
Schedule of Product Warranty Liability [Table Text Block]	The activity in the accrued warranty liabilities account was as follows (in thousands):
		2014			2013			2012
	Balance at beginning of period	$	4,153		$	4,858		$	6,310
	Additions charged to costs and expenses for current-year sales	9,437			4,603			4,114
	Deductions from reserves	(8,118		)	(6,070		)	(5,094		)
	Changes in liability for pre-existing warranties during the current year, including expirations	352			230			(472		)
	Acquired warranty reserve	—			532			—
	Balance at end of period	$	5,824		$	4,153		$	4,858

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	12 Months Ended
	Jan. 03, 2015
Fair Value Disclosures [Abstract]
Assets and Liabilities that are Measured at Fair Value on a Recurring Basis	The following tables set forth by level within the fair value hierarchy, our financial assets that were accounted for at fair value on a recurring basis, according to the valuation techniques we used to determine their fair value (in thousands):
		January 3, 2015
		Level 1		Level 2		Level 3		Total
	Marketable debt securities – current
	U.S. Treasury securities	$	17,506	$	—	$	—	$	17,506
	Corporate bonds	—		20,139		—		20,139
	U.S. Agency bonds	—		12,525		—		12,525
	Municipal bonds	—		6,953		—		6,953
	Commercial paper	—		12,486		—		12,486
		17,506		52,103		—		69,609
	Marketable debt securities – non-current
	U.S. Treasury securities	14,990		—		—		14,990
	Corporate bonds	—		15,236		—		15,236
	U.S. Agency bonds	—		10,014		—		10,014
	Municipal bonds	—		4,201		—		4,201
		14,990		29,451		—		44,441
		$	32,496	$	81,554	$	—	$	114,050
		December 28, 2013
		Level 1		Level 2		Level 3		Total
	Marketable debt securities – current
	U.S. Treasury securities	$	15,011	$	—	$	—	$	15,011
	Corporate bonds	—		20,300		—		20,300
	U.S. Agency bonds	—		12,025		—		12,025
	Municipal bonds	—		4,823		—		4,823
		15,011		37,148		—		52,159
	Marketable debt securities – non-current
	U.S. Treasury securities	8,978		—		—		8,978
	Corporate bonds	—		15,484		—		15,484
	U.S. Agency bonds	—		7,498		—		7,498
	Municipal bonds	—		2,672		—		2,672
		8,978		25,654		—		34,632
		$	23,989	$	62,802	$	—	$	86,791

Purchase_of_Comfortaire_Tables

Purchase of Comfortaire (Tables)	12 Months Ended
	Jan. 03, 2015
Purchase of Comfortaire [Abstract]
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]	The following table summarizes the final fair value of the net assets acquired (in thousands):
	Accounts receivable	$	365
	Inventories	678
	Other assets	248
	Property and equipment	513
	Goodwill	6,113
	Intangible assets	8,638
	Total assets acquired	16,555
	Accounts payable	404
	Warranty liabilities	532
	Other liabilities	119
	Total liabilities acquired	1,055
	Net assets acquired	$	15,500
Finite-Lived and Indefinite-Lived Intangible Assets Acquired as Part of Business Combination [Table Text Block]	Identifiable intangible assets and the associated estimated useful lives are as follows (in thousands):
			Estimated
			Useful Life
	Developed technologies		10 years	$	4,829
	Customer relationships		7 years	2,413
	Trade name/trademarks		Indefinite-Lived	1,396
				$	8,638

Investments_Tables

Investments (Tables)	12 Months Ended
	Jan. 03, 2015
Investments [Abstract]
Investments of marketable debt securities	Investments in marketable debt securities were comprised of the following (in thousands):
		January 3, 2015
		Amortized		Unrealized		Unrealized			Fair
		Cost		Gains		Losses			Value
	U.S. Treasury securities	$	32,507	$	12	$	(23	)	$	32,496
	Corporate bonds	35,409		2		(36		)	35,375
	U.S. Agency bonds	22,545		4		(10		)	22,539
	Municipal bonds	11,157		2		(5		)	11,154
	Commercial paper	12,487		—		(1		)	12,486
		$	114,105	$	20	$	(75	)	$	114,050
		December 28, 2013
		Amortized		Unrealized		Unrealized			Fair
		Cost		Gains		Losses			Value
	U.S. Treasury securities	$	23,975	$	15	$	(1	)	$	23,989
	Corporate bonds	35,804		3		(23		)	35,784
	U.S. Agency bonds	19,517		10		(4		)	19,523
	Municipal bonds	7,474		23		(2		)	7,495
		$	86,770	$	51	$	(30	)	$	86,791
Maturities of marketable debt securities	Maturities of marketable debt securities were as follows (in thousands):
		January 3, 2015				December 28, 2013
		Amortized		Fair		Amortized			Fair
		Cost		Value		Cost			Value
	Marketable debt securities – current (due in less than one year)	$	69,607	$	69,609	$	52,122		$	52,159
	Marketable debt securities – non-current (due in one to two years)	44,498		44,441		34,648			34,632
		$	114,105	$	114,050	$	86,770		$	86,791

Inventories_Tables

Inventories (Tables)	12 Months Ended
	Jan. 03, 2015
Inventory Disclosure [Abstract]
Schedule of Inventory, Current [Table Text Block]	Inventories consisted of the following (in thousands):
		January 3,		December 28,
		2015		2013
	Raw materials	$	10,220	$	7,118
	Work in progress	411		505
	Finished goods	42,904		32,529
		$	53,535	$	40,152

Property_and_Equipment_Tables

Property and Equipment (Tables)	12 Months Ended
	Jan. 03, 2015
Property and Equipment [Abstract]
Property, Plant and Equipment [Table Text Block]	Property and equipment consisted of the following (in thousands):
		January 3,			December 28,
		2015			2013
	Land	$	1,999		$	1,999
	Leasehold improvements	89,203			84,659
	Furniture and equipment	59,587			46,226
	Production machinery, computer equipment and software	122,913			106,072
	Property under capital lease	1,077			1,672
	Construction in progress	56,937			32,670
	Less: Accumulated depreciation and amortization	(166,263		)	(143,756		)
		$	165,453		$	129,542

Goodwill_and_Intangible_Assets1

Goodwill and Intangible Assets (Tables)	12 Months Ended
	Jan. 03, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Indefinite-Lived Intangible Assets	The following is a roll forward of goodwill and indefinite-lived trade name/trademarks (in thousands):
			Twelve Months Ended						Twelve Months Ended
			January 3, 2015						December 28, 2013
			Goodwill			Indefinite-Lived			Goodwill			Indefinite-Lived
						Trade Name/						Trade Name/
						Trademarks						Trademarks
		Beginning balance	$	8,963		$	1,396		$	2,850		$	—
		Comfortaire purchase	—			—			6,113			1,396
		Ending balance	$	8,963		$	1,396		$	8,963		$	1,396
Definite-Lived Intangible Assets	The following table provides the gross carrying amount and related accumulated amortization of our definite-lived intangible assets (in thousands):
		January 3, 2015						December 28, 2013
		Gross Carrying			Accumulated			Gross Carrying			Accumulated
		Amount			Amortization			Amount			Amortization
	Developed technologies	$	5,231		$	1,342		$	5,231		$	850
	Customer relationships	2,413			675			2,413			330
	Trade names/trademarks	101			101			101			101
		$	7,745		$	2,118		$	7,745		$	1,281

Leases_Tables

Leases (Tables)	12 Months Ended
	Jan. 03, 2015
Leases [Abstract]
Rent Expense [Table Text Block]	Rent expense was as follows (in thousands):
	Facility Rents:	2014		2013		2012
	Minimum rents	$	47,754	$	41,816	$	36,104
	Contingent rents	6,241		5,779		9,813
	Total	$	53,995	$	47,595	$	45,917
	Equipment Rents	$	3,609	$	2,694	$	2,627
Aggregate minimum rental commitments under operating leases and future maturities of capital leases [Table Text Block]	The aggregate minimum rental commitments under operating leases for subsequent years are as follows (in thousands):
	2015	$	48,366
	2016	44,813
	2017	39,188
	2018	28,236
	2019	18,679
	Thereafter	53,567
	Total future minimum lease payments	$	232,849

Shareholders_Equity_Tables

Shareholders' Equity (Tables)	12 Months Ended
	Jan. 03, 2015
Shareholders' Equity [Abstract]
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan	Total stock-based compensation expense was as follows (in thousands):
			2014			2013				2012
	Stock options		$	2,125		$	2,698			$	3,688
	Stock awards		4,673			1,534				6,618
	Total stock-based compensation expense(1)(2)		6,798			4,232				10,306
	Income tax benefit		2,284			1,447				3,576
	Total stock-based compensation expense, net of tax		$	4,514		$	2,785			$	6,730
	(1) Includes $(0.5) million and $5.6 million of CEO transition (benefit) costs in 2013 and 2012, respectively. See CEO Transition Costs on page 57.
	(2) Reflects a $1.2 million benefit in 2014 related to a change in estimated forfeitures due to employee turnover.
Schedule of Share-based Compensation, Stock Options, Activity	A summary of our stock option activity was as follows (in thousands, except per share amounts and years):
			Stock		Weighted-				Weighted-		Aggregate
			Options		Average				Average		Intrinsic
					Exercise				Remaining		Value (1)
					Price per				Contractual
					Share				Term (years)
	Outstanding at December 28, 2013		1,754		$	15.77			5.6		$	11,812
	Granted		201		17.96
	Exercised		(244	)	12.15
	Canceled/Forfeited		(198	)	20.19
	Outstanding at January 3, 2015		1,513		$	16.06			5.6		$	16,642
	Exercisable at January 3, 2015		1,088		$	14.32			4.5		$	13,800
	Vested and expected to vest at January 3, 2015		1,455		$	15.86			5.5		$	16,279
	(1)	Aggregate intrinsic value includes only those options where the current share price is equal to or greater than the share price on the date of grant.
Schedule Of Additional Information Related To Stock Option	Other information pertaining to options is as follows (in thousands, except per share amounts):
			2014			2013				2012
	Weighted-average grant date fair value of stock options granted		$	9.33		$	10.57			$	14.28
	Total intrinsic value (at exercise) of stock options exercised		$	2,478		$	7,726			$	12,724
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions	The assumptions used to calculate the fair value of options granted using the Black-Scholes-Merton option-pricing model were as follows:
	Valuation Assumptions		2014		2013			2012
	Expected dividend yield		0	%	0	%		0	%
	Expected volatility		58	%	61	%		63	%
	Risk-free interest rate		1.8	%	0.9	%		1.1	%
	Expected term (in years)		5.3		5.7			5.6
Schedule Of Share Based Compensation Stock And Performance- and Market-based Stock Award Activity	Stock award activity was as follows (in thousands, except per share amounts):
			Time-		Weighted-Average			Performance- and			Weighted-Average
			Based		Grant Date			Market-Based			Grant Date
			Stock		Fair Value			Stock Awards			Fair Value
			Awards
	Outstanding at December 28, 2013		239		$18.86			461			$17.39
	Granted		319		17.96			409			17.75
	Vested		(60	)	13.3			(130	)		9.05
	Canceled/Forfeited		(26	)	18.04			(110	)		18.23
	Outstanding at January 3, 2015		472		$19.00			630			$18.61
Share Repurchase	Repurchases of our common stock were as follows (in thousands):
			2014			2013				2012
	Amount repurchased under Board-approved share repurchase program		$	45,044		$	40,037			$	30,023
	Amount repurchased in connection with the vesting of employee restricted stock grants		1,448			2,035				4,869
	Total amount repurchased		$	46,492		$	42,072			$	34,892
Schedule of Earnings Per Share Reconciliation	The components of basic and diluted net income per share are as follows (in thousands, except per share amounts):
		2014			2013				2012
	Net income	$	67,974		$	60,081			$	78,094
	Reconciliation of weighted-average shares outstanding:
	Basic weighted-average shares outstanding	53,452			54,866				55,516
	Effect of dilutive securities:
	Options	387			554				1,059
	Restricted shares	354			383				501
	Diluted weighted-average shares outstanding	54,193			55,803				57,076
	Net income per share – basic	$	1.27		$	1.1			$	1.41
	Net income per share – diluted	$	1.25		$	1.08			$	1.37

Other_Income_Expense_Net_Table

Other Income (Expense), Net (Tables)	12 Months Ended
	Jan. 03, 2015
Other Income and Expenses [Abstract]
Other Expense, Net	Other income, net, consisted of the following (in thousands):
		2014			2013			2012
	Interest income	$	415		$	375		310
	Interest expense	(53		)	(52		)	(92		)
	Other income, net	$	362		$	323		$	218

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Jan. 03, 2015
Income Tax Disclosure [Abstract]
Income tax expense (benefit)	Income tax expense consisted of the following (in thousands):
	Current:	2014				2013				2012
	Federal	$	29,484			$	25,091			$	34,993
	State	4,161				3,802				3,419
		33,645				28,893				38,412
	Deferred:
	Federal	747				1,953				2,176
	State	(258		)		84				1,323
		489				2,037				3,499
	Income tax expense	$	34,134			$	30,930			$	41,911
Reconciliation of income tax expense (benefit) at the statutory federal rate	The following table provides a reconciliation between the statutory federal income tax rate and our effective income tax rate:
		2014			2013			2012
	Statutory federal income tax	35	%		35	%		35	%
	State income taxes, net of federal benefit	2.5			3			2.9
	Manufacturing deduction	(3.3	)		(3.2	)		(3.1	)
	Changes in unrecognized tax benefits	0.3			0.3			(0.2	)
	Other	(1.1	)		(1.1	)		0.3
	Effective income tax rate	33.4	%		34	%		34.9	%
Deferred income taxes	The tax effects of temporary differences that give rise to deferred income taxes were as follows (in thousands):
	Deferred tax assets:	2014				2013
	Current:
	Warranty and returns liabilities	$	5,753			$	4,376
	Compensation and benefits	1,545				1,379
	Deferred rent and lease incentives	991				857
	Other	709				539
	Long-term:
	Stock-based compensation	6,843				5,944
	Deferred rent and lease incentives	5,527				4,524
	Warranty liabilities	1,051				605
	Net operating loss and capital loss carryforwards	649				827
	Other	—				1,111
	Total gross deferred tax assets	23,068				20,162
	Valuation allowance	(552		)		(587		)
	Total deferred tax assets after valuation allowance	22,516				19,575
	Deferred tax liabilities:
	Long-term:
	Property and equipment	9,873				7,696
	Other	424				—
	Total gross deferred tax liabilities	10,297				7,696
	Net deferred tax assets	$	12,219			$	11,879

Summary_of_Quarterly_Financial1

Summary of Quarterly Financial Data (unaudited) (Tables)	12 Months Ended
	Jan. 03, 2015
Summary of Quarterly Financial Data (unaudited) [Abstract]
Schedule of Quarterly Financial Information [Table Text Block]	The following is a condensed summary of our quarterly results (in thousands, except net income per share amounts). Quarterly diluted net income per share amounts may not total to the respective annual amount due to changes in weighted-average shares outstanding during the year.
	2014	First		Second		Third		Fourth		Fiscal
										Year
	Net sales	$	276,412	$	234,763	$	323,366	$	322,216	$	1,156,757
	Gross profit	171,383		142,397		198,584		194,486		706,850
	Operating income	25,802		12,711		35,346		27,887		101,746
	Net income	16,992		8,481		23,554		18,947		67,974
	Net income per share – diluted	0.31		0.16		0.44		0.35		1.25
	2013	First		Second		Third		Fourth		Fiscal
										Year
	Net sales	$	258,237	$	207,391	$	263,689	$	230,854	$	960,171
	Gross profit	163,416		131,398		166,420		140,521		601,755
	Operating income	35,227		15,107		30,699		9,655		90,688
	Net income	23,471		9,926		20,259		6,425		60,081
	Net income per share – diluted	0.42		0.18		0.36		0.12		1.08

Business_and_Summary_of_Signif4

Business and Summary of Significant Accounting Policies Fiscal Year (Details)	12 Months Ended
	Jan. 03, 2015	Dec. 28, 2013	Dec. 29, 2012
Fiscal Year [Abstract]
Number Of Weeks In Fiscal Year	P53W	P52W	P52W

Business_and_Summary_of_Signif5

Business and Summary of Significant Accounting Policies Cash and Cash Equivalents (Details) (Accounts Payable [Member], USD $)	Jan. 03, 2015	Dec. 28, 2013
In Millions, unless otherwise specified
Accounts Payable [Member]
Cash and Cash Equivalents [Line Items]
Book Overdrafts	$19.60	$13.40

Business_and_Summary_of_Signif6

Business and Summary of Significant Accounting Policies Property and Equipment (Details)	12 Months Ended
	Jan. 03, 2015
Leasehold Improvements [Member] | Minimum [Member]
Property and equipment [Line Items]
Property, Plant and Equipment, Useful Life	5 years
Leasehold Improvements [Member] | Maximum [Member]
Property and equipment [Line Items]
Property, Plant and Equipment, Useful Life	10 years
Furniture and Fixtures [Member] | Minimum [Member]
Property and equipment [Line Items]
Property, Plant and Equipment, Useful Life	5 years
Furniture and Fixtures [Member] | Maximum [Member]
Property and equipment [Line Items]
Property, Plant and Equipment, Useful Life	7 years
Machinery and Equipment Computer Hardware Software [Member] | Minimum [Member]
Property and equipment [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Machinery and Equipment Computer Hardware Software [Member] | Maximum [Member]
Property and equipment [Line Items]
Property, Plant and Equipment, Useful Life	7 years
Assets Held under Capital Leases [Member] | Minimum [Member]
Property and equipment [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Assets Held under Capital Leases [Member] | Maximum [Member]
Property and equipment [Line Items]
Property, Plant and Equipment, Useful Life	4 years

Business_and_Summary_of_Signif7

Business and Summary of Significant Accounting Policies Definite-Lived Intangible Assets (Details)	12 Months Ended
	Jan. 03, 2015
Minimum [Member]
Definite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	7 years
Maximum [Member]
Definite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	17 years

Business_and_Summary_of_Signif8

Business and Summary of Significant Accounting Policies Warranty Liabilities (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Jan. 03, 2015	Dec. 28, 2013	Dec. 29, 2012
Movement in Standard Product Warranty Accrual [Roll Forward]
Balance at beginning of year	$4,153	$4,858	$6,310
Additions charged to costs and expenses for current-year sales	9,437	4,603	4,114
Deductions from reserves	-8,118	-6,070	-5,094
Changes in liability for pre-existing warranties during the current year, including expirations	352	230	-472
Acquired warranty reserve	0	532	0
Balance at end of period	$5,824	$4,153	$4,858

Business_and_Summary_of_Signif9

Business and Summary of Significant Accounting Policies Revenue Recognition (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Jan. 03, 2015
Deferred Revenue [Line Items]
Deferred Revenue	9.4
Deferred Costs	5.9
Nonsoftware Service, Support and Maintenance Arrangement [Member]
Deferred Revenue [Line Items]
Product's Estimated Life	5 years
Other Current Assets [Member]
Deferred Revenue [Line Items]
Deferred Costs, Current	1.2
Other Noncurrent Assets [Member]
Deferred Revenue [Line Items]
Deferred Costs, Noncurrent	4.7
Other Current Liabilities [Member]
Deferred Revenue [Line Items]
Deferred Revenue, Current	2
Other Noncurrent Liabilities [Member]
Deferred Revenue [Line Items]
Deferred Revenue, Noncurrent	7.4

Recovered_Sheet1

Business and Summary of Significant Accounting Policies Operating Leases (Details) (USD $)	Jan. 03, 2015	Dec. 28, 2013
In Millions, unless otherwise specified
Other Noncurrent Liabilities [Member]
Property and equipment [Line Items]
Deferred Rent Credit, Noncurrent	$6.50	$5.50
Deferred Lease Incentives, Noncurrent	8.4	7.2
Other Current Liabilities [Member]
Property and equipment [Line Items]
Deferred Rent Credit, Current	0.3	0.5
Deferred Lease Incentives, Current	$2.60	$2

Recovered_Sheet2

Business and Summary of Significant Accounting Policies Advertising Costs (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Jan. 03, 2015	Dec. 28, 2013	Dec. 29, 2012
Advertising Expense	$158.50	$144.80	$126.90
Prepaid Expenses [Member]
Prepaid Advertising	$5.30	$6.20

Recovered_Sheet3

Business and Summary of Significant Accounting Policies Insurance (Details) (USD $)	Jan. 03, 2015	Dec. 28, 2013
In Millions, unless otherwise specified
Self Insurance Reserve	$7.80	$6.80
Compensation and Benefits [Member]
Self Insurance Reserve, Current	4.4	3.3
Other Noncurrent Liabilities [Member]
Self Insurance Reserve, Noncurrent	3.4	3.5
Other Current Assets [Member]
Restricted Deposit Workers Compensation	$3.20	$2.70

Recovered_Sheet4

Business and Summary of Significant Accounting Policies Stock-Based Compensation (Details)	12 Months Ended
In Millions, unless otherwise specified	Jan. 03, 2015
	stock_plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock plans approved by shareholders	2
Number of Shares Available for Grant	4.8
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Expiration Period	10 years
Minimum [Member] | Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Vesting Period	2 years
Minimum [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Vesting Period	2 years
Maximum [Member] | Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Vesting Period	4 years
Maximum [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Vesting Period	4 years
2014 Performance Stock Award Grant [Member] | Minimum [Member] | Performance-Based Stock Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Awards - Shares Awarded - Increase (Decrease), Percentage	0.00%
2014 Performance Stock Award Grant [Member] | Maximum [Member] | Performance-Based Stock Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Awards - Shares Awarded - Increase (Decrease), Percentage	200.00%
2013 Performance Stock Award Grant [Member] | Minimum [Member] | Performance-Based Stock Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Awards - Shares Awarded - Increase (Decrease), Percentage	0.00%
2013 Performance Stock Award Grant [Member] | Maximum [Member] | Performance-Based Stock Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Awards - Shares Awarded - Increase (Decrease), Percentage	200.00%
2012 Performance Stock Award Grant [Member] | Minimum [Member] | Performance-Based Stock Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Awards - Shares Awarded - Increase (Decrease), Percentage	0.00%
2012 Performance Stock Award Grant [Member] | Maximum [Member] | Performance-Based Stock Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Awards - Shares Awarded - Increase (Decrease), Percentage	150.00%
2014 Market-Based Stock Award Grant [Member] | Minimum [Member] | Market-Based Stock Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Awards - Shares Awarded - Increase (Decrease), Percentage	0.00%
2014 Market-Based Stock Award Grant [Member] | Maximum [Member] | Market-Based Stock Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Awards - Shares Awarded - Increase (Decrease), Percentage	100.00%

Fair_Value_Measurements_Detail

Fair Value Measurements (Details) (Recurring [Member], USD $)	Jan. 03, 2015	Dec. 28, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable debt securities - current	$69,609,000	$52,159,000
Marketable debt securities - noncurrent	44,441,000	34,632,000
Marketable debt securities	114,050,000	86,791,000
Deferred compensation plan liability	1,000,000	1,100,000
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable debt securities - current	17,506,000	15,011,000
Marketable debt securities - noncurrent	14,990,000	8,978,000
Marketable debt securities	32,496,000	23,989,000
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable debt securities - current	52,103,000	37,148,000
Marketable debt securities - noncurrent	29,451,000	25,654,000
Marketable debt securities	81,554,000	62,802,000
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable debt securities - current	0	0
Marketable debt securities - noncurrent	0	0
Marketable debt securities	0	0
Available-for-sale Securities [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred Compensation Plan Assets	1,000,000	1,100,000
US Treasury Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable debt securities - current	17,506,000	15,011,000
Marketable debt securities - noncurrent	14,990,000	8,978,000
US Treasury Securities [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable debt securities - current	17,506,000	15,011,000
Marketable debt securities - noncurrent	14,990,000	8,978,000
US Treasury Securities [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable debt securities - current	0	0
Marketable debt securities - noncurrent	0	0
US Treasury Securities [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable debt securities - current	0	0
Marketable debt securities - noncurrent	0	0
Corporate Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable debt securities - current	20,139,000	20,300,000
Marketable debt securities - noncurrent	15,236,000	15,484,000
Corporate Bonds [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable debt securities - current	0	0
Marketable debt securities - noncurrent	0	0
Corporate Bonds [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable debt securities - current	20,139,000	20,300,000
Marketable debt securities - noncurrent	15,236,000	15,484,000
Corporate Bonds [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable debt securities - current	0	0
Marketable debt securities - noncurrent	0	0
U.S. Agency bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable debt securities - current	12,525,000	12,025,000
Marketable debt securities - noncurrent	10,014,000	7,498,000
U.S. Agency bonds [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable debt securities - current	0	0
Marketable debt securities - noncurrent	0	0
U.S. Agency bonds [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable debt securities - current	12,525,000	12,025,000
Marketable debt securities - noncurrent	10,014,000	7,498,000
U.S. Agency bonds [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable debt securities - current	0	0
Marketable debt securities - noncurrent	0	0
Municipal Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable debt securities - current	6,953,000	4,823,000
Marketable debt securities - noncurrent	4,201,000	2,672,000
Municipal Bonds [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable debt securities - current	0	0
Marketable debt securities - noncurrent	0	0
Municipal Bonds [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable debt securities - current	6,953,000	4,823,000
Marketable debt securities - noncurrent	4,201,000	2,672,000
Municipal Bonds [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable debt securities - current	0	0
Marketable debt securities - noncurrent	0	0
Commercial Paper, Not Included with Cash and Cash Equivalents [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable debt securities - current	12,486,000
Commercial Paper, Not Included with Cash and Cash Equivalents [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable debt securities - current	0
Commercial Paper, Not Included with Cash and Cash Equivalents [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable debt securities - current	12,486,000
Commercial Paper, Not Included with Cash and Cash Equivalents [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable debt securities - current	$0

Purchase_of_Comfortaire_Detail

Purchase of Comfortaire (Details) (USD $)	0 Months Ended	12 Months Ended
	Jan. 17, 2013	Jan. 03, 2015	Dec. 28, 2013	Dec. 29, 2012
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross	$15,500,000	$0	$15,500,000	$0
Acquired Goodwill and Intangible Assets - Tax Deductibility Period (in years)	15 years
Indefinite-lived Intangible Assets Acquired		0	1,396,000
Assets Acquired - Goodwill		8,963,000	8,963,000	2,850,000
Business Acquisition, Revenue Reported by Acquired Entity for Last Annual Period				10,500,000
Comfortaire Corporation [Member]
Business Acquisition [Line Items]
Assets Acquired - Accounts Receivables	365,000
Assets Acquired - Inventory	678,000
Assets Acquired - Other, Current	248,000
Assets Acquired - Property, Plant, and Equipment	513,000
Assets Acquired - Goodwill	6,113,000
Assets Acquired - Intangible Assets	8,638,000		8,638,000
Assets Acquired - Total Assets	16,555,000
Liabilities Acquired - Accounts Payable	404,000
Liabilities Acquired - Warranty	532,000
Liabilities Acquired - Other, Current	119,000
Liabilities Acquired - Total Liabilities	1,055,000
Net Assets Acquired	15,500,000
Developed Technology Rights [Member] | Comfortaire Corporation [Member]
Business Acquisition [Line Items]
Acquired Intangible Assets - Estimated Useful Life		10 years
Finite-lived Intangible Assets Acquired			4,829,000
Customer Lists [Member] | Comfortaire Corporation [Member]
Business Acquisition [Line Items]
Acquired Intangible Assets - Estimated Useful Life		7 years
Finite-lived Intangible Assets Acquired			2,413,000
Trademarks and Trade Names [Member] | Comfortaire Corporation [Member]
Business Acquisition [Line Items]
Indefinite-lived Intangible Assets Acquired			$1,396,000

Investments_Marketable_Debt_Se

Investments - Marketable Debt Securities (Details) (USD $)	12 Months Ended
	Jan. 03, 2015	Dec. 28, 2013	Dec. 29, 2012
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Gross Realized Gains (Losses), Sale Proceeds	$54,200,000	$53,300,000	$26,000,000
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	20,000	51,000
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	75,000	30,000
Available-for-sale Debt Securities, Amortized Cost Basis	114,105,000	86,770,000
Available-for-sale Securities, Debt Securities	114,050,000	86,791,000
Amortized Cost [Abstract]
Marketable debt securities - current (due in less than one year)	69,607,000	52,122,000
Marketable debt securities - non-current (due in one to two years)	44,498,000	34,648,000
Marketable debt securities	114,105,000	86,770,000
Fair Value [Abstract]
Marketable debt securities - current (due in less than one year)	69,609,000	52,159,000
Marketable debt securities - non-current (due in one to two years)	44,441,000	34,632,000
U.S. Treasury securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	12,000	15,000
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	23,000	1,000
Available-for-sale Debt Securities, Amortized Cost Basis	32,507,000	23,975,000
Available-for-sale Securities, Debt Securities	32,496,000	23,989,000
Amortized Cost [Abstract]
Marketable debt securities	32,507,000	23,975,000
Corporate bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	2,000	3,000
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	36,000	23,000
Available-for-sale Debt Securities, Amortized Cost Basis	35,409,000	35,804,000
Available-for-sale Securities, Debt Securities	35,375,000	35,784,000
Amortized Cost [Abstract]
Marketable debt securities	35,409,000	35,804,000
U.S. Agency bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	4,000	10,000
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	10,000	4,000
Available-for-sale Debt Securities, Amortized Cost Basis	22,545,000	19,517,000
Available-for-sale Securities, Debt Securities	22,539,000	19,523,000
Amortized Cost [Abstract]
Marketable debt securities	22,545,000	19,517,000
Municipal bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	2,000	23,000
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	5,000	2,000
Available-for-sale Debt Securities, Amortized Cost Basis	11,157,000	7,474,000
Available-for-sale Securities, Debt Securities	11,154,000	7,495,000
Amortized Cost [Abstract]
Marketable debt securities	11,157,000	7,474,000
Commercial Paper, Not Included with Cash and Cash Equivalents [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	0
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	1,000
Available-for-sale Debt Securities, Amortized Cost Basis	12,487,000
Available-for-sale Securities, Debt Securities	12,486,000
Amortized Cost [Abstract]
Marketable debt securities	$12,487,000

Investments_Other_Investments_

Investments - Other Investments (Details) (Other Noncurrent Assets [Member], USD $)	Jan. 03, 2015	Dec. 28, 2013
In Millions, unless otherwise specified
Other Noncurrent Assets [Member]
Cost Method Investments	$6	$4.50

Inventories_Details

Inventories (Details) (USD $)	Jan. 03, 2015	Dec. 28, 2013
Inventory Disclosure [Abstract]
Raw materials	$10,220,000	$7,118,000
Work in progress	411,000	505,000
Finished goods	42,904,000	32,529,000
Inventories	53,535,000	40,152,000
Components of finished goods inventory [Abstract]
Finished beds included in finished goods inventory	20,400,000	13,400,000
Finished components included in finished goods inventory	14,700,000	11,300,000
Retail accessories included in finished goods inventory	$7,800,000	$7,800,000

Property_and_Equipment_Details

Property and Equipment (Details) (USD $)	Jan. 03, 2015	Dec. 28, 2013
In Thousands, unless otherwise specified
Property and equipment [Line Items]
Less: Accumulated depreciation and amortization	($166,263)	($143,756)
Property and equipment, net	165,453	129,542
Land [Member]
Property and equipment [Line Items]
Property and equipment, gross	1,999	1,999
Leasehold Improvements [Member]
Property and equipment [Line Items]
Property and equipment, gross	89,203	84,659
Office furniture and equipment [Member]
Property and equipment [Line Items]
Property and equipment, gross	59,587	46,226
Production machinery, computer equipment and software [Member]
Property and equipment [Line Items]
Property and equipment, gross	122,913	106,072
Property under capital lease [Member]
Property and equipment [Line Items]
Property and equipment, gross	1,077	1,672
Construction in Progress [Member]
Property and equipment [Line Items]
Property and equipment, gross	$56,937	$32,670

Goodwill_and_Intangible_Assets2

Goodwill and Intangible Assets Goodwill and Indefinite-Lived Intangible Assets (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Jan. 03, 2015	Dec. 28, 2013
Goodwill [Roll Forward]
Beginning balance	$8,963	$2,850
Comfortaire purchase	0	6,113
Ending balance	8,963	8,963
Indefinite-Lived Intangible Assets [Roll Forward]
Beginning balance	1,396	0
Indefinite-lived Intangible Assets Acquired	0	1,396
Ending balance	$1,396	$1,396

Goodwill_and_Intangible_Assets3

Goodwill and Intangible Assets Definite-Lived Intangible Assets (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 28, 2013	Jan. 03, 2015
Definite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets	$7,745	$7,745
Finite-Lived Intangible Assets, Accumulated Amortization	1,281	2,118
Developed technologies [Member]
Definite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets	5,231	5,231
Finite-Lived Intangible Assets, Accumulated Amortization	850	1,342
Customer Relationships [Member]
Definite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets	2,413	2,413
Finite-Lived Intangible Assets, Accumulated Amortization	330	675
Trademarks and Trade Names [Member]
Definite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets	101	101
Finite-Lived Intangible Assets, Accumulated Amortization	101	101
Comfortaire Corporation [Member] | Developed Technology Rights [Member]
Definite-Lived Intangible Assets [Line Items]
Comfortaire purchase	4,829
Comfortaire Corporation [Member] | Customer Lists [Member]
Definite-Lived Intangible Assets [Line Items]
Comfortaire purchase	$2,413

Leases_Details

Leases (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Jan. 03, 2015	Dec. 28, 2013	Dec. 29, 2012
Operating Leases, Future Minimum Payments Due [Abstract]
2015	$48,366
2016	44,813
2017	39,188
2018	28,236
2019	18,679
Thereafter	53,567
Total future minimum lease payments	232,849
Facility Rents [Member]
Rent Expense
Minimum Rents	47,754	41,816	36,104
Contingent Rents	6,241	5,779	9,813
Total	53,995	47,595	45,917
Equipment Rents [Member]
Rent Expense
Total	$3,609	$2,694	$2,627

Debt_Details

Debt (Details) (Amended Credit Facility, Wells Fargo Bank [Member], USD $)	12 Months Ended
	Jan. 03, 2015	Dec. 28, 2013
Amended Credit Facility, Wells Fargo Bank [Member]
Line of Credit Facility [Line Items]
Amended maturity date of the credit facility	31-Aug-16
Current borrowing capacity	$20,000,000
Maximum borrowing capacity	50,000,000
Debt Instrument, Basis Spread on Variable Rate	1.25%
Adjusted Base Rate - Daily One-Month LIBO Rate basis (in hundredths)	1.50%
Available remaining borrowing capacity	20,000,000	20,000,000
Outstanding letters of credit	$0	$0

Shareholders_Equity_Stock_Base

Shareholders' Equity Stock Based Compensation Expense (Details) (USD $)	12 Months Ended
	Jan. 03, 2015		Dec. 28, 2013		Dec. 29, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$6,798,000	[1]	$4,232,000	[2]	$10,306,000	[2]
Income tax benefit	2,284,000		1,447,000		3,576,000
Total stock-based compensation expense, net of tax	4,514,000		2,785,000		6,730,000
CEO transition costs	0		-534,000		5,595,000
Share-based Compensation, Impact of Change in Forfeiture Rate	-1,200,000
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	2,125,000		2,698,000		3,688,000
Time-based, Performance-based and Market-based Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$4,673,000		$1,534,000		$6,618,000
[1]	Reflects a $1.2 million benefit in 2014 related to a change in estimated forfeitures due to employee turnover.
[2]	Includes $(0.5) million and $5.6 million of CEO transition (benefit) costs in 2013 and 2012, respectively. See CEO Transition Costs on page 57.

Shareholders_Equity_Stock_Opti

Shareholders' Equity Stock Options (Details) (Employee Stock Option [Member], USD $)	12 Months Ended
Share data in Thousands, except Per Share data, unless otherwise specified	Jan. 03, 2015		Dec. 28, 2013		Dec. 29, 2012
Employee Stock Option [Member]
Stock options activity [Roll Forward]
Stock options - outstanding beginning of period	1,754
Stock options - granted during period	201
Stock options - exercised during period	-244
Stock options - canceled/forfeited during period	-198
Stock options - outstanding end of period	1,513		1,754
Stock options - exercisable at end of period	1,088
Vested and expected to vest - outstanding	1,455
Weighted- Average Exercise Price per Share
Stock options - weighted average exercise price per share, outstanding	$15.77
Stock options - weighted average exercise price per share, granted	$17.96
Stock options - weighted average exercise price per share, exercised	$12.15
Stock options - weighted average exercise price per share, forfeited/canceled	$20.19
Stock options - weighted average exercise price per share, outstanding	$16.06		$15.77
Stock options - weighted average exercise price per share, exercisable	$14.32
Stock options - weighted average exercise price per share, vested and expected to vest	$15.86
Weighted- Average Remaining Contractual Term
Stock options - weighted average remaining contractual term (years) outstanding	5 years 7 months 6 days		5 years 7 months 6 days
Stock options - weighted average remaining contractual terms (years) exercisable	4 years 6 months
Stock options - weighted average remaining contractual term (years) vested and expected to vest	5 years 6 months
Aggregate Intrinsic Value
Stock options - aggregate intrinsic value outstanding	$16,642,000	[1]	$11,812,000	[1]
Stock options - aggregate intrinsic value exercisable	13,800,000	[1]
Stock options - aggregate intrinsic value vested and expected to vest	16,279,000	[1]
Other information - options [Abstract]
Weighted-average grant date fair value of stock options granted	$9.33		$10.57		$14.28
Total intrinsic value (at exercise) of stock options exercised	2,478,000		7,726,000		12,724,000
Proceeds from stock options exercised	2,900,000
Tax benefit, exercise of stock options	1,000,000
Stock-based compensation expense related to non-vested awards	$2,900,000
Weighted average period to recognize remaining expense over	1 year 7 months 6 days
Stock Option Valuation Assumptions [Abstract]
Fair value assumptions, method used	Black-Scholes-Merton option-pricing model
Expected dividend yield (in hundredths)	0.00%		0.00%		0.00%
Expected volatility (in hundredths)	58.00%		61.00%		63.00%
Risk-free interest rate (in hundredths)	1.80%		0.90%		1.10%
Expected term (in years)	5 years 3 months 18 days		5 years 8 months 12 days		5 years 7 months 6 days
[1]	Aggregate intrinsic value includes only those options where the current share price is equal to or greater than the share price on the date of grant.

Shareholders_Equity_Stock_Awar

Shareholders' Equity Stock Awards (Details) (USD $)	12 Months Ended
In Millions, except Share data, unless otherwise specified	Jan. 03, 2015
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense related to non-vested awards	$4.40
Weighted average period to recognize remaining expense over	2 years
Stock awards [Roll Forward]
Outstanding at December 28, 2013	239,000
Granted	319,000
Vested	-60,000
Canceled/Forfeited	-26,000
Outstanding at January 3, 2015	472,000
Weighted-Average Grant Date Fair Value
Outstanding at December 28, 2013	$18.86
Granted	$17.96
Vested	$13.30
Canceled/Forfeited	$18.04
Outstanding at January 3, 2015	$19
Performance-Based and Market-Based Stock Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense related to non-vested awards	$6.70
Weighted average period to recognize remaining expense over	2 years 1 month 6 days
Stock awards [Roll Forward]
Outstanding at December 28, 2013	461,000
Granted	409,000
Vested	-130,000
Canceled/Forfeited	-110,000
Outstanding at January 3, 2015	630,000
Weighted-Average Grant Date Fair Value
Outstanding at December 28, 2013	$17.39
Granted	$17.75
Vested	$9.05
Canceled/Forfeited	$18.23
Outstanding at January 3, 2015	$18.61
Market-Based Stock Award [Member]
Stock awards [Roll Forward]
Granted	126,550
Weighted-Average Grant Date Fair Value
Granted	$14.90
Fair value assumptions, method used	Monte Carlo simulation model
Expected dividend yield (in hundredths)	0.00%
Expected volatility (in hundredths)	58.00%
Risk-free interest rate (in hundredths)	0.90%

Shareholders_Equity_Repurchase

Shareholders' Equity Repurchase of Common Stock (Details) (USD $)	12 Months Ended
	Jan. 03, 2015	Dec. 28, 2013	Dec. 29, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amount repurchased under Board approved share repurchase program	$45,044,000	$40,037,000	$30,023,000
Total amount repurchased	46,492,000	42,072,000	34,892,000
Authorized repurchase amount	235,000,000
Time-Based Stock Awards And Performance Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Repurchase Acquired Through Tax Withholding Restricted Stock	$1,448,000	$2,035,000	$4,869,000

Shareholders_Equity_CEO_Transi

Shareholders' Equity CEO Transition Costs (Details) (USD $)	12 Months Ended
	Jan. 03, 2015	Dec. 28, 2013	Dec. 29, 2012
CEO Transition Costs (Details) [Abstract]
CEO transition costs	$0	($534,000)	$5,595,000
CEO transition costs, net of tax	$0	($400,000)	$3,700,000

Shareholders_Equity_Net_Income

Shareholders' Equity Net Income per Common Share (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, except Share data, unless otherwise specified	Jan. 03, 2015	Sep. 27, 2014	Jun. 28, 2014	Mar. 29, 2014	Dec. 28, 2013	Sep. 28, 2013	Jun. 29, 2013	Mar. 30, 2013	Jan. 03, 2015	Dec. 28, 2013	Dec. 29, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income	$18,947	$23,554	$8,481	$16,992	$6,425	$20,259	$9,926	$23,471	$67,974	$60,081	$78,094
Basic weighted-average shares outstanding									53,452,000	54,866,000	55,516,000
Diluted weighted-average shares outstanding									54,193,000	55,803,000	57,076,000
Net income per share – basic									$1.27	$1.10	$1.41
Net income per share – diluted	$0.35	$0.44	$0.16	$0.31	$0.12	$0.36	$0.18	$0.42	$1.25	$1.08	$1.37
Employee Stock Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount									800,000	1,300,000	300,000
Employee Stock Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Effect of dilutive securities									387,000	554,000	1,059,000
Time-based, Performance-based and Market-based Stock Awards [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Effect of dilutive securities									354,000	383,000	501,000

Other_Income_Expense_Net_Detai

Other Income (Expense), Net (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Jan. 03, 2015	Dec. 28, 2013	Dec. 29, 2012
Other Income and Expenses [Abstract]
Interest income	$415	$375	$310
Interest expense	-53	-52	-92
Other income, net	$362	$323	$218

Income_Taxes_Income_Tax_Expens

Income Taxes Income Tax Expense (benefit) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Jan. 03, 2015	Dec. 28, 2013	Dec. 29, 2012
Current:
Federal	$29,484	$25,091	$34,993
State	4,161	3,802	3,419
Current Income Tax Expense	33,645	28,893	38,412
Deferred:
Federal	747	1,953	2,176
State	-258	84	1,323
Deferred Income Tax Expense	489	2,037	3,499
Income Tax Expense	$34,134	$30,930	$41,911

Income_Taxes_Income_Tax_Expens1

Income Taxes Income Tax Expense (Benefit) Reconciliation to Statutory Rate (Details)	12 Months Ended
	Jan. 03, 2015	Dec. 28, 2013	Dec. 29, 2012
Income Tax Disclosure [Abstract]
Statutory federal income tax	35.00%	35.00%	35.00%
State income taxes, net of federal benefit	2.50%	3.00%	2.90%
Manufacturing deduction	-3.30%	-3.20%	-3.10%
Changes in unrecognized tax benefits	0.30%	0.30%	-0.20%
Other	-1.10%	-1.10%	0.30%
Effective income tax rate	33.40%	34.00%	34.90%

Income_Taxes_Deferred_Income_T

Income Taxes Deferred Income Taxes (Details) (USD $)	Jan. 03, 2015	Dec. 28, 2013
Current Deferred Tax Assets [Abstract]
Warranty and returns liabilities	$5,753,000	$4,376,000
Compensation and benefits	1,545,000	1,379,000
Deferred rent and lease incentives	991,000	857,000
Other	709,000	539,000
Long-term Deferred Tax Assets [Abstract]
Stock-based compensation	6,843,000	5,944,000
Deferred rent and lease incentives	5,527,000	4,524,000
Warranty liability	1,051,000	605,000
Net operating loss and capital loss carryforwards	649,000	827,000
Other	0	1,111,000
Total gross deferred tax assets	23,068,000	20,162,000
Valuation allowance	-552,000	-587,000
Total deferred tax assets after valuation allowance	22,516,000	19,575,000
Long-term Deferred Tax Liabilities [Abstract]
Property and equipment	9,873,000	7,696,000
Other	424,000	0
Total gross deferred tax liabilities	10,297,000	7,696,000
Net deferred tax assets	12,219,000	11,879,000
State Operating Loss Carryforwards, Expiring between 2014 and 2033	$2,300,000

Profit_Sharing_and_401K_Plan_D

Profit Sharing and 401(K) Plan (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Jan. 03, 2015	Dec. 28, 2013	Dec. 29, 2012
Profit Sharing and 401 (k) Plan [Abstract]
Employee compensation deferral (in hundredths)	50.00%
Employer contributions	$3.70	$3	$2.50

Commitments_and_Contingencies_1

Commitments and Contingencies (Details) (Purchase Commitment [Member], USD $)	12 Months Ended
	Jan. 03, 2015
	lease_commitment
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Inventory Purchase Commitments	$7,500,000
Future Retail Sites [Member]
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Number of future retail store lease commitments	10
Future retail store leases, Rent Expense, Minimum Rentals	$14,000,000
Minimum [Member] | Future Retail Sites [Member]
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Future retail store lease commitments term	5 years
Maximum [Member] | Future Retail Sites [Member]
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Future retail store lease commitments term	10 years

Summary_of_Quarterly_Financial2

Summary of Quarterly Financial Data (unaudited) (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Jan. 03, 2015	Sep. 27, 2014	Jun. 28, 2014	Mar. 29, 2014	Dec. 28, 2013	Sep. 28, 2013	Jun. 29, 2013	Mar. 30, 2013	Jan. 03, 2015	Dec. 28, 2013	Dec. 29, 2012
Summary of Quarterly Financial Data (unaudited) [Abstract]
Net sales	$322,216	$323,366	$234,763	$276,412	$230,854	$263,689	$207,391	$258,237	$1,156,757	$960,171	$934,978
Gross profit	194,486	198,584	142,397	171,383	140,521	166,420	131,398	163,416	706,850	601,755	596,546
Operating income	27,887	35,346	12,711	25,802	9,655	30,699	15,107	35,227	101,746	90,688	119,787
Net income	$18,947	$23,554	$8,481	$16,992	$6,425	$20,259	$9,926	$23,471	$67,974	$60,081	$78,094
Net income per share – diluted	$0.35	$0.44	$0.16	$0.31	$0.12	$0.36	$0.18	$0.42	$1.25	$1.08	$1.37

Schedule_II_Valuation_and_Qual1

Schedule II - Valuation and Qualifying Accounts (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Jan. 03, 2015	Dec. 28, 2013	Dec. 29, 2012
Allowance for Doubtful Accounts [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	$425	$348	$397
Additions charged to costs and expenses	729	776	246
Deductions from reserves	-415	-699	-295
Balance at end of period	739	425	348
Allowance for Sales Returns [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	9,433	5,330	4,402
Additions charged to costs and expenses	78,890	59,656	44,284
Deductions from reserves	-73,061	-55,553	-43,356
Balance at end of period	$15,262	$9,433	$5,330