v3.8.0.1
Summary of Accounting Policies - Additional Information (Details)
 3 Months Ended 12 Months Ended
Dec. 22, 2017
Dec. 21, 2017
Jun. 29, 2016
Sep. 30, 2017
USD ($)
ft²
Mar. 26, 2016
USD ($)
Dec. 26, 2015
USD ($)
Dec. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 26, 2015
USD ($)
Aug. 31, 2017
ft²
Apr. 14, 2016
ft²
Entity Information [Line Items]                      
Refunds to customers             $ 7,000,000 $ 6,100,000 $ 5,600,000    
Concentration risk, percentage             100.00% 100.00% 100.00%    
Foreign currency transaction (loss) arising during period, net of tax             $ 1,800,000 $ (1,300,000) $ (1,300,000)    
Restructuring charges             3,136,000 714,000 0    
Goodwill, impairment loss                 8,000,000    
Capitalized computer software, impairments               0 100,000    
Capitalized computer software, additions             0 0 400,000    
Depreciation             1,600,000 1,600,000 1,600,000    
Impairment of leasehold       $ 500,000     500,000        
Penalties and interest accrued           $ 0 $ 0 $ 0 $ 0    
U.S. federal taxes at statutory rate 21.00% 34.00%         34.00% 34.00% 34.00%    
Expected dividend yield             0.00% 0.00%      
Advertising expense             $ 47,400,000 $ 51,500,000 $ 54,500,000    
Restructuring charges       $ 2,600,000     2,620,000        
Intangible assets, net             $ 1,142,000 $ 1,708,000      
Effective income tax rate reconciliation, share-based compensation, excess tax benefit, amount         $ 2,000,000            
Minimum                      
Entity Information [Line Items]                      
Estimated useful lives, intangible assets             1 year        
Maximum                      
Entity Information [Line Items]                      
Estimated useful lives, intangible assets             10 years        
Citrus Lane Inc                      
Entity Information [Line Items]                      
Goodwill, impairment loss                 $ 41,800,000    
Impairment of intangible assets (excluding goodwill)           $ 1,700,000          
Series A Redeemable Convertible Preferred Stock                      
Entity Information [Line Items]                      
Preferred stock, dividend rate, percentage     5.50%                
Customer One | Unbilled Accounts Receivable | Credit Concentration Risk                      
Entity Information [Line Items]                      
Concentration risk, percentage               14.00%      
Massachusetts                      
Entity Information [Line Items]                      
Area of real estate property | ft²                     108,743
Property Subject to Operating Lease | Massachusetts                      
Entity Information [Line Items]                      
Area of real estate property | ft²       25,812           25,812 10,362
Accounting Standards Update 2015-05                      
Entity Information [Line Items]                      
Intangible assets, net             $ 100