PENSION, PROFIT SHARING AND OTHER BENEFIT PLANS (Details) $ in Thousands	12 Months Ended
	Sep. 30, 2015 USD ($) item	Sep. 30, 2014 USD ($) item	Sep. 30, 2013 USD ($) item	Sep. 30, 2010
Defined Contribution Plans
Minimum discretionary contribution with Board of Directors | item	0.5	0.5	0.5
Company contributions to defined contribution plan	$ 14,200	$ 19,600	$ 19,700
Amounts recognized in Accumulated OCI
Valuation allowance on deffered tax asset	$ (54,759)	(14,024)
Equity securities
Weighted-average assumptions used to determine net periodic benefit cost at the end of the year
Target allocation percentage, minimum	20.00%
Target allocation percentage, maximum	55.00%
Debt securities
Weighted-average assumptions used to determine net periodic benefit cost at the end of the year
Target allocation percentage, minimum	25.00%
Target allocation percentage, maximum	75.00%
Cash
Weighted-average assumptions used to determine net periodic benefit cost at the end of the year
Target allocation percentage, minimum	0.00%
Target allocation percentage, maximum	55.00%
Real Estate
Change in plan assets:
Fair value of plan assets at the beginning of the year	$ 7,096
Fair value of plan assets at the end of the year	$ 8,166	7,096
Weighted-average assumptions used to determine net periodic benefit cost at the end of the year
Target allocation percentage, minimum	0.00%
Target allocation percentage, maximum	10.00%
Defined Benefit Pension Plans
Defined Benefit Pension Plans
Number of European employees covered by contributory defined benefit pension plan for which benefits were frozen (as a percent)				50.00%
Decrease in benefit obligation as a result of plan amendments		1,700
Expected contribution to defined benefit pension plans in next fiscal year	$ 5,100
Unrecognized actuarial loss expected to be recognized in net pension cost over next fiscal year	2,000
Deferred compensation plans
Unrecognized actuarial loss expected to be recognized in net pension cost over next fiscal year, net of tax	1,500
Plan assets expected to be returned in 2016	0
Projected benefit obligation, ABO and fair value of plan assets for the defined benefit pension plans in which the ABO was in excess of the fair value of plan assets
Projected benefit obligation	227,527	224,201
Accumulated benefit obligation	227,527	224,201
Fair value of plan assets	201,502	206,982
Change in benefit obligations:
Net benefit obligation at the beginning of the year	224,201	209,118
Service cost	670	636	532
Interest cost	9,073	9,967	8,867
Actuarial loss (gain)	8,203	10,730
Plan amendments		(1,044)
Gross benefits paid	(7,047)	(6,229)
Foreign currency exchange rate changes	(7,573)	1,023
Net benefit obligation at the end of the year	227,527	224,201	209,118
Change in plan assets:
Fair value of plan assets at the beginning of the year	206,982	188,337
Actual return on plan assets	2,815	21,127
Employer contributions	6,206	3,728
Gross benefits paid	(7,047)	(6,229)
Administrative expenses	(682)	(730)
Foreign currency exchange rate changes	(6,772)	749
Fair value of plan assets at the end of the year	201,502	206,982	188,337
Unfunded status of the plans	(26,025)	(17,219)
Unrecognized net actuarial loss	51,087	33,376
Net amount recognized	25,062	16,157
Amounts recognized in Accumulated OCI
Liability adjustment to OCI	(51,087)	(33,376)
Deferred tax asset	15,260	9,925
Valuation allowance on deffered tax asset	(3,415)
Accumulated other comprehensive loss	(39,242)	(23,451)
Components of net periodic pension cost (benefit)
Service cost	670	636	532
Interest cost	9,073	9,967	8,867
Expected return on plan assets	(13,835)	(13,183)	(11,605)
Amortization of actuarial loss	705	802	1,798
Administrative expenses	163	152	76
Net pension benefit	$ (3,224)	$ (1,626)	$ (332)
Weighted-average assumptions used to determine benefit obligation at the end of the year
Discount rate (as a percent)	4.10%	4.20%	4.80%
Rate of compensation increase (as a percent)	3.10%	3.20%	4.40%
Weighted-average assumptions used to determine net periodic benefit cost at the end of the year
Discount rate (as a percent)	4.20%	4.80%	4.30%
Expected return on plan assets (as a percent)	6.90%	7.00%	7.00%
Rate of compensation increase (as a percent)	3.20%	4.40%	3.80%
Non-qualified deferred compensation plan
Deferred compensation plans
Liabilities associated with the non-qualified deferred compensation plan	$ 9,900	$ 9,500
Assets set aside to fund deferred compensation liabilities	2,900
Non-qualified deferred compensation plan | Life insurance contracts
Deferred compensation plans
Assets set aside to fund deferred compensation liabilities	1,900
Non-qualified deferred compensation plan | Marketable securities
Deferred compensation plans
Assets set aside to fund deferred compensation liabilities	$ 1,000