STOCKHOLDERS' EQUITY (Details)		12 Months Ended
	Mar. 21, 2013 shares	Sep. 30, 2015 category item shares	Sep. 30, 2014 shares
Stockholders' Equity
Vesting period		3 years
RSUs
Stockholders' Equity
Number of units awarded (in shares)		322,428	305,074
Number of shares of common stock that each award holder has the contingent right to receive		1
Total number of awards granted (in shares)		1,054,013
Total number of awards vested (in shares)		230,110
Total number of unvested awards ultimately expected to vest (in shares)		287,568
Awards vested (in shares)		160,499	69,994
Time-based RSUs
Stockholders' Equity
Number of units awarded (in shares)	565,409
Number of equal installments for vesting of stock awards | item		4
Performance-based RSUs
Stockholders' Equity
Number of units awarded (in shares)	488,604
Vesting period		3 years
Number of vesting criteria which have to be satisfied out of total vesting criteria | category		1
Number of vesting criteria | category		3