SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES [Abstract]
Maximum maturity period considered for classification of cash equivalents	90 days
Percentage of arrangements in which fees is charged directly to constituent (in hundredths)	90.00%
Contract life considered for recognition of deferred revenue	1 year
Maximum maturity days for unrestricted investments to classify as cash equivalents	90 days
Advertising expense	$ 1.6	$ 1.3	$ 0.7
Property, Plant and Equipment [Line Items]
Impairment of goodwill	0
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible assets	$ 0
Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life of property, equipment and software	7 years
Finite-Lived Intangible Assets [Line Items]
Amortization period of intangible assets	10 years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	5 years
Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life of property, equipment and software	2 years
Finite-Lived Intangible Assets [Line Items]
Amortization period of intangible assets	5 years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years