INCOME TAXES (Details 3) (USD $)	3 Months Ended								12 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Reconciliation of income tax computed at the U.S. federal statutory tax rate to income tax expense
Tax at U.S. statutory rate									$ 13,921,000	$ 48,287,000	$ 42,165,000
State income taxes, net of federal tax effect									120,000	1,364,000	1,297,000
Nondeductible expenses									1,609,000	286,000	893,000
Change in reserve accrued for tax contingencies									(673,000)	(2,752,000)	2,154,000
Impact of goodwill impairment loss									10,046,000
Change in valuation allowance									4,044,000
Tax effect from foreign earnings repatriation										2,773,000
Foreign earnings taxes at less than statutory rate									(7,521,000)	(7,847,000)	(6,787,000)
R&D credits generated in the current year									(3,202,000)	(906,000)	(2,696,000)
Reinstatement of federal research and development credit									(1,937,000)		(1,406,000)
Manufacturing deduction									(1,333,000)	(630,000)	(1,476,000)
Other									(572,000)	(243,000)	(25,000)
Total income tax expense	(5,935,000)	7,292,000	7,276,000	5,869,000	8,951,000	11,667,000	10,758,000	8,956,000	14,502,000	40,332,000	34,119,000
Net changes in the liability for unrecognized tax benefits
Balance at the beginning of the period				8,649,000				10,940,000	8,649,000	10,940,000
Increase (decrease) related to tax positions in prior years:
Recognition of benefits from expiration of statutes									(575,000)	(1,227,000)
Settlements with taxing authorities									(2,332,000)	(1,257,000)
Other									824,000	(586,000)
Tax positions related to the current year									552,000	567,000
Currency translation adjustment									(40,000)	212,000
Balance at the end of the period	7,078,000				8,649,000				7,078,000	8,649,000	10,940,000
Unrecognized tax benefits from permanent tax adjustments that, if recognized, would affect the effective rate	4,800,000								4,800,000
Unrecognized tax benefits related to settlements with taxing authorities									2,200,000
Interest and penalties accrued	2,200,000				3,700,000				2,200,000	3,700,000
Total liability for uncertain tax issues	9,300,000				12,300,000				9,300,000	12,300,000
Cash amounts paid for income taxes, net of refunds received									42,100,000	25,400,000	42,100,000
Components of income before income taxes
United States									(31,640,000)	38,692,000	33,879,000
Foreign									71,411,000	99,271,000	86,594,000
Income before income taxes	(43,087,000)	25,697,000	36,978,000	20,183,000	30,918,000	39,115,000	36,665,000	31,265,000	39,771,000	137,963,000	120,473,000
Approximate amount of undistributed earnings of all the entity's foreign subsidiaries	292,200,000								292,200,000
Undistributed earnings of foreign subsidiaries available for distribution	$ 0								$ 0