General form of registration statement for all companies including face-amount certificate companies

Summary of Significant Accounting Policies - Insurance and Revenues (Details)

v3.7.0.1
Summary of Significant Accounting Policies - Insurance and Revenues (Details)
1 Months Ended 3 Months Ended 12 Months Ended
Nov. 30, 2016
derivative
Nov. 24, 2016
derivative
Mar. 30, 2017
USD ($)
Mar. 31, 2016
USD ($)
Dec. 29, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 25, 2014
USD ($)
Dec. 26, 2013
derivative
Jan. 01, 2016
USD ($)
Self-Insurance Reserves                  
Maximum loss before additional coverage applies     $ 5,000,000   $ 5,000,000        
Derivative Financial Instruments                  
Cash flow hedge ineffectiveness during the period     0 $ 0 0 $ 0      
Revenue Recognition and Gift Cards                  
Gift card breakage income     166,000 66,000 627,000 511,000 $ 355,000    
Sales Returns and Allowances                  
Allowance for sales returns     5,530,000 4,277,000 4,887,000 3,720,000      
Advertising and Pre-opening Expense                  
Pre-opening expenses     4,167,000 3,316,000 13,732,000 7,380,000 7,412,000    
Selling and store operating expenses and pre-opening expenses                  
Advertising and Pre-opening Expense                  
Advertising expense     $ 10,626,000 $ 8,778,000 $ 33,497,000 $ 24,478,000 $ 17,359,000    
Interest Rate Cap                  
Derivative Financial Instruments                  
Number of derivatives designated cash flow hedges entered into during period | derivative 2 2              
Interest Rate Swap                  
Derivative Financial Instruments                  
Number of derivatives designated cash flow hedges entered into during period | derivative               2  
Minimum                  
Advertising and Pre-opening Expense                  
Period prior to store opening or relocation that pre-opening expenses begin     3 months   3 months        
Stock-Based Compensation                  
Period of vesting provision     3 years   3 years        
Maximum                  
Revenue Recognition and Gift Cards                  
Number of days customers may store merchandise     14 days   14 days        
Advertising and Pre-opening Expense                  
Period prior to store opening or relocation that pre-opening expenses begin     6 months   6 months        
Stock-Based Compensation                  
Period of vesting provision     5 years   5 years        
Workers' compensation                  
Self-Insurance Reserves                  
Per occurrence deductible     $ 250,000   $ 250,000        
General liability                  
Self-Insurance Reserves                  
Per occurrence deductible     $ 150,000   $ 150,000        
Retained earnings | Accounting Standards Update 2016-09 [Member]                  
Cumulative effect of adoption                 $ (148,000)
Additional paid-in capital | Accounting Standards Update 2016-09 [Member]                  
Cumulative effect of adoption                 $ 238,000