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
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      
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      
Workers' compensation                
Self-Insurance Reserves                
Per occurrence deductible     $ 250,000   $ 250,000      
General liability                
Self-Insurance Reserves                
Per occurrence deductible     $ 150,000   $ 150,000