STOCKHOLDERS' EQUITY (Details 2) (RSUs, USD $)	12 Months Ended		0 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Oct. 02, 2014 Subsequent event
Number of Shares
Balance unvested at the beginning of the period (in shares)	421,369
Granted (in shares)	305,074	426,511
Vested (in shares)	(69,994)		(105,886)
Forfeited (in shares)	(13,500)	(5,142)
Balance unvested at the end of the period (in shares)	642,949	421,369
Weighted Average Grant-Date Fair Value
Balance unvested at the beginning of the period (in dollars per share)	$ 43.76
Granted (in dollars per share)	$ 49.57	$ 43.76
Vested (in dollars per share)	$ 43.76
Forfeited (in dollars per share)	$ 47.80	$ 43.76
Balance unvested at the end of the period (in dollars per share)	$ 46.43	$ 43.76
Shares available for future grants	3,746,426