STOCK-BASED COMPENSATION - Stock Option Awards Activity (Details) - Stock Option Awards	12 Months Ended
	Sep. 30, 2016 $ / shares shares
Stock Options
Outstanding at beginning of period (in shares) | shares	28,500
Exercised (in shares) | shares	(27,750)
Forfeited (in shares) | shares	(750)
Outstanding at end of period (in shares) | shares	0
Weighted Average Exercise Price Per Share
Outstanding at beginning of period (in dollars per share) | $ / shares	$ 33.65
Exercised (in dollars per share) | $ / shares	33.66
Forfeited (in dollars per share) | $ / shares	33.45
Outstanding at end of period (in dollars per share) | $ / shares	$ 0.00