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Long-Term Debt (Trace RDA Loan and Trace Working Capital Loan) - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended
Dec. 26, 2017
Sep. 30, 2018
Sep. 30, 2017
Debt Instrument [Line Items]      
Prepayment of loan   $ 67 $ 136
Trace RDA Loan [Member]      
Debt Instrument [Line Items]      
Debt instrument maturity period   15 years  
Prepayment of loan $ 3,548    
Debt instrument description   Prime rate plus 1% with a floor of 5.5%.  
Debt instrument interest rate, basis spread 1.00%    
Debt instrument, interest rate floor 5.50%    
Effective interest rate   6.25%  
Trace RDA Loan [Member] | Mortgages [Member]      
Debt Instrument [Line Items]      
Loan agreement amount   $ 9,975  
Date of loan agreement   Jul. 05, 2012