INCOME TAXES (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Income Tax Contingency [Line Items]
Operating loss carryforwards	$ 5,900
Tax credit carryforward	5,200
Windfall tax benefits from stock option exercises	6,600	$ 19,800
Windfall tax benefit from share-based payment arrangements	13,200
Undistributed earnings	2,900,000
Additional income tax expense, undistributed foreign earnings	670,000
Unrecognized tax benefits	16,053	13,775
Estimated accrued interest and penalties	3,800
Reasonably possible amount of unrecognized tax benefits to be recognized in fiscal year	1,000
Internal Revenue Service (IRS) [Member]
Income Tax Contingency [Line Items]
Operating loss carryforwards, valuation allowance	$ 21,800	$ 38,600