STOCKHOLDERS’ EQUITY (Details)	12 Months Ended
	Sep. 30, 2016 category item shares
Stockholders' Equity
Vesting period	3 years
RSUs
Stockholders' Equity
Number of units awarded (in shares)	1,525,640
Number of shares of common stock that each award holder has the contingent right to receive	1
Total number of unvested awards ultimately expected to vest (in shares)	409,619
Vested awards to date	345,318
Time-based RSUs
Stockholders' Equity
Number of units awarded (in shares)	740,384
Number of equal installments for vesting of stock awards | item	4
Performance-based RSUs
Stockholders' Equity
Number of units awarded (in shares)	785,256
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