INCOME TAXES (Details 3) (USD $)	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Reconciliation of income tax computed at the U.S. federal statutory tax rate to income tax expense
Tax expense at U.S. statutory rate	$ 31,290,000	$ 13,921,000	$ 48,287,000
State income taxes, net of federal tax effect	111,000	120,000	1,364,000
Nondeductible expenses	1,319,000	1,609,000	286,000
Change in reserve for tax contingencies	(601,000)	(673,000)	(2,752,000)
Impact of goodwill impairment loss		10,046,000
Change in deferred tax asset valuation allowance	921,000	4,044,000
Tax effect from foreign earnings repatriation			2,773,000
Foreign earnings taxes at less than statutory rate	(12,783,000)	(7,521,000)	(7,847,000)
R&D credits generated in the current year	(584,000)	(3,202,000)	(906,000)
Reinstatement of federal research and development credit		(1,937,000)
Manufacturing deduction		(1,333,000)	(630,000)
Other	158,000	(572,000)	(243,000)
Total income tax expense	19,831,000	14,502,000	40,332,000
Net changes in the liability for unrecognized tax benefits
Balance at the beginning of the period	8,441,000	9,833,000
Increase (decrease) related to tax positions in prior years:
Recognition of benefits from expiration of statutes	(973,000)	(575,000)
Settlements with taxing authorities	(728,000)	(2,332,000)
Other	(54,000)	824,000
Tax positions related to the current year	743,000	731,000
Currency translation adjustment	(123,000)	(40,000)
Balance at the end of the period	7,306,000	8,441,000	9,833,000
Unrecognized tax benefits from permanent tax adjustments that, if recognized, would affect the effective rate	4,700,000
Unrecognized tax benefits related to settlements with taxing authorities	1,000,000
Interest and penalties accrued	1,600,000	2,200,000
Total liability for uncertain tax issues	8,000,000	9,300,000
Cash amounts paid for income taxes, net of refunds received	27,300,000	42,100,000	25,400,000
Components of income before income taxes
United States	(22,788,000)	(31,640,000)	38,692,000
Foreign	112,199,000	71,411,000	99,271,000
Income before income taxes	$ 89,411,000	$ 39,771,000	$ 137,963,000