STOCK-BASED COMPENSATION - Stock Option Awards Activity (Details) - Stock Option Awards $ / shares in Units, $ in Millions	12 Months Ended
	Sep. 30, 2015 USD ($) $ / shares shares
Stock Options
Outstanding at beginning of period (in shares)	79,750
Exercised (in shares)	(47,000)
Forfeited (in shares)	(4,250)
Outstanding at end of period (in shares)	28,500
Fully Vested and Expected to Vest at end of period (in shares)	28,500
Exercisable at end of period (in shares)	28,500
Weighted Average Exercise Price Per Share
Outstanding at beginning of period (in dollars per share) | $ / shares	$ 32.42
Exercised (in dollars per share) | $ / shares	31.76
Forfeited (in dollars per share) | $ / shares	30.95
Outstanding at end of period (in dollars per share) | $ / shares	33.65
Fully Vested and Expected to Vest at end of period (in dollars per share) | $ / shares	33.65
Exercisable at end of period (in dollars per share) | $ / shares	$ 33.65
Stock Options (Additional Information)
Outstanding at end of period, weighted average remaining contractual term - stock options	9 months 18 days
Fully Vested and Expected to Vest at end of period, weighted average remaining contractual term - stock options	9 months 18 days
Exercisable at end of period, weighted average remaining contractual term - stock options	9 months 18 days
Outstanding at end of period, aggregate intrinsic value - stock options | $	$ 0.6
Fully Vested and Expected to Vest at end of period, aggregate intrinsic value - stock options | $	0.6
Exercisable at end of period, aggregate intrinsic value - stock options | $	$ 0.6