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STOCK-BASED COMPENSATION - Valuation Assumptions (Details) - USD ($)
9 Months Ended
Jun. 30, 2017
Jul. 01, 2016
Assumptions for Black-Scholes:    
Risk-free interest rate 1.50% 1.10%
Expected term in years 4 years 4 years
Volatility 39.00% 39.00%
Expected annual dividends $ 0 $ 0
Value of options granted:    
Number of options granted (in shares) 57,500 10,000
Weighted average fair value per share (in dollars per share) $ 1.19 $ 1.40
Fair value of options granted (000s) $ 68,000 $ 14,000