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STOCKHOLDERS' EQUITY: - Compensation Plan (Details)
$ / shares in Units, $ in Millions
 9 Months Ended 12 Months Ended
Jan. 31, 2015
$ / shares
Jan. 31, 2015
MXN / shares
Sep. 30, 2016
USD ($)
$ / shares
shares
Sep. 30, 2015
USD ($)
$ / shares
shares
Dec. 31, 2010
$ / shares
Dec. 31, 2010
MXN / shares
Employee Stock Purchase 2007 Plan            
Stock award activity, Shares            
Outstanding shares at the beginning of the year | shares     109,241 4,298,612    
Exercised (in shares) | shares     (64,380) (4,189,371)    
Outstanding shares at the end of the year | shares     44,861 109,241    
Unit Weighted Average Grant Date Fair Value            
Outstanding shares at the beginning of the year (in dollars per share) | $ / shares     $ 1.16 $ 1.16    
Exercised (in dollars per share) | $ / shares     1.16 1.16    
Outstanding shares at the end of the year (in dollars per share) | $ / shares     $ 1.16 $ 1.16    
Employee Stock Purchase 2010 Plan            
Information related to compensation cost            
Stock based compensation expense | $     $ 0.4 $ 0.4    
Unrecognized compensation expense | $     $ 1.2 $ 1.7    
Period over which unrecognized compensation expense expected to be recognized     2 years 3 months      
Purchase price for initial subscription (in dollars per share) | (per share)         $ 2.05 MXN 26.51
Stock award activity, Shares            
Outstanding shares at the beginning of the year | shares     2,227,582 2,287,891    
Exercised (in shares) | shares     (740,601) (60,309)    
Outstanding shares at the end of the year | shares     1,486,981 2,227,582    
Unit Weighted Average Grant Date Fair Value            
Outstanding shares at the beginning of the year (in dollars per share) | $ / shares     $ 2.05 $ 2.05    
Exercised (in dollars per share) | $ / shares     2.05 2.05    
Outstanding shares at the end of the year (in dollars per share) | $ / shares     $ 2.05 $ 2.05    
Employee Stock Purchase 2015 Plan            
Information related to compensation cost            
Stock based compensation expense | $     $ 0.4 $ 0.2    
Unrecognized compensation expense | $     $ 4.0 $ 4.6    
Purchase price for initial subscription (in dollars per share) | (per share) $ 2.63 MXN 38.44        
Stock award activity, Shares            
Outstanding shares at the beginning of the year | shares     2,656,386      
Granted (in shares) | shares       2,656,386    
Exercised (in shares) | shares     (103,852)      
Outstanding shares at the end of the year | shares     2,552,534 2,656,386    
Unit Weighted Average Grant Date Fair Value            
Outstanding shares at the beginning of the year (in dollars per share) | $ / shares     $ 2.63      
Granted (in dollars per share) | $ / shares       $ 2.63    
Exercised (in dollars per share) | $ / shares     2.63      
Outstanding shares at the end of the year (in dollars per share) | $ / shares     $ 2.63 $ 2.63