INCOME TAXES (Narrative) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009
Income taxes:
Deferred tax assets related to operating loss carryforwards in foreign jurisdictions	$ 35.0
Deferred tax assets related to domestic federal net operating loss carryforwards	1.9
Deferred tax assets related to state net operating loss carryforwards	2.5
Deferred tax assets related to state credits	1.5
Deferred tax assets related to credits in foreign jurisdictions	0.3
One-time tax benefit related to restructuring of a portion of international operations	(11.0)
Valuation allowance on deferred tax assets	8.6	8.1
Estimated decrease in unrecognized tax benefits, lower bound	3.0
Estimated decrease in unrecognized tax benefits, upper bound	7.0
Total gross unrecognized tax benefits	9.8	17.8	24.0	35.5
Unrecognized tax benefits that would impact effective tax rate, if recognized	8.4	11.5	8.0
Accrued interest and penalties related to unrecognized tax benefits	0.8	1.9	2.1
Income tax expense for interest and penalties	0.1	(0.1)	3.0
Income Tax Holiday [Line Items]
Impact of tax holidays	$ 1.7	$ 0.7
Benefit of tax holidays on net income per share (diluted)	$ 0.03	$ 0.01
Singapore Tax Authority [Member]
Income Tax Holiday [Line Items]
Income tax holiday, year of expiration	2016
Puerto Rico Tax Authority [Member]
Income Tax Holiday [Line Items]
Income tax holiday, year of expiration	2025
Minimum [Member]
Income taxes:
Operating loss carryforwards, year of expiration	2013
Tax credit carryforwards, year of expiration	2013
Maximum [Member]
Income taxes:
Operating loss carryforwards, year of expiration	2031
Tax credit carryforwards, year of expiration	2027