CONSOLIDATING GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION (Details) - Summary of Condensed Consolidating Statements of Operations and Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016	Mar. 31, 2015
Condensed Income Statements, Captions [Line Items]
Revenue	$ 500,107	$ 500,020	$ 994,256	$ 1,002,180
Cost of goods and services	385,950	385,645	763,994	769,816
Gross profit	114,157	114,375	230,262	232,364
Selling, general and administrative expenses	91,586	93,566	182,885	187,462
Total operating expenses	91,586		182,885	187,462
Income from operations	22,571	20,809	47,377	44,902
Other income (expense)
Interest income (expense), net	(12,348)	(11,857)	(24,360)	(23,494)
Loss from debt extinguishment, net		0		0
Other, net	(385)	(757)	170	(1,208)
Total other expense, net	(12,733)	(12,614)	(24,190)	(24,702)
Income before taxes	9,838	8,195	23,187	20,200
Provision (benefit) for income taxes	3,743	3,073	8,496	7,607
Income (loss) before equity in net income of subsidiaries	6,095	5,122	14,691	12,593
Equity in net income (loss) of subsidiaries	0	0	0	0
Net income	6,095	5,122	14,691	12,593
Foreign currency translation adjustments	13,683	(30,384)	10,334	(45,884)
Other comprehensive income (loss), net of taxes	12,420	(30,019)	8,442	(46,202)
Comprehensive income (loss), net	18,515	(24,897)	23,133	(33,609)
Parent Company [Member]
Condensed Income Statements, Captions [Line Items]
Revenue	0	0	0	0
Cost of goods and services	0	0	0	0
Gross profit	0	0	0	0
Selling, general and administrative expenses	6,530	5,301	12,928	10,821
Total operating expenses	6,530		12,928	10,821
Income from operations	(6,530)	(5,301)	(12,928)	(10,821)
Other income (expense)
Interest income (expense), net	(2,696)	(2,224)	(4,952)	(4,128)
Loss from debt extinguishment, net		0		0
Other, net	18	521	211	567
Total other expense, net	(2,678)	(1,703)	(4,741)	(3,561)
Income before taxes	(9,208)	(7,004)	(17,669)	(14,382)
Provision (benefit) for income taxes	(3,650)	(1,984)	(9,447)	(5,465)
Income (loss) before equity in net income of subsidiaries	(5,558)	(5,020)	(8,222)	(8,917)
Equity in net income (loss) of subsidiaries	11,653	10,142	22,913	21,510
Net income	6,095	5,122	14,691	12,593
Other comprehensive income (loss), net of taxes	12,420	(30,019)	8,442	(46,202)
Comprehensive income (loss), net	18,515	(24,897)	23,133	(33,609)
Guarantor Companies [Member]
Condensed Income Statements, Captions [Line Items]
Revenue	406,989	400,042	796,249	778,156
Cost of goods and services	313,203	306,625	611,587	595,995
Gross profit	93,786	93,417	184,662	182,161
Selling, general and administrative expenses	66,197	71,970	132,144	141,527
Total operating expenses	66,197		132,144	141,527
Income from operations	27,589	21,447	52,518	40,634
Other income (expense)
Interest income (expense), net	(7,752)	(7,698)	(15,541)	(15,125)
Loss from debt extinguishment, net		0		0
Other, net	904	1,615	1,920	2,910
Total other expense, net	(6,848)	(6,083)	(13,621)	(12,215)
Income before taxes	20,741	15,364	38,897	28,419
Provision (benefit) for income taxes	8,012	3,062	16,829	10,799
Income (loss) before equity in net income of subsidiaries	12,729	12,302	22,068	17,620
Equity in net income (loss) of subsidiaries	(1,108)	(735)	821	5,301
Net income	11,621	11,567	22,889	22,921
Other comprehensive income (loss), net of taxes	2,062	(12,075)	2,201	(16,655)
Comprehensive income (loss), net	13,683	(508)	25,090	6,266
Non-Guarantor Companies [Member]
Condensed Income Statements, Captions [Line Items]
Revenue	100,614	113,206	213,346	252,087
Cost of goods and services	80,493	91,320	168,389	199,594
Gross profit	20,121	21,886	44,957	52,493
Selling, general and administrative expenses	18,952	17,349	37,998	37,448
Total operating expenses	18,952		37,998	37,448
Income from operations	1,169	4,537	6,959	15,045
Other income (expense)
Interest income (expense), net	(1,900)	(1,935)	(3,867)	(4,241)
Loss from debt extinguishment, net		0		0
Other, net	(964)	(2,767)	(1,133)	(4,641)
Total other expense, net	(2,864)	(4,702)	(5,000)	(8,882)
Income before taxes	(1,695)	(165)	1,959	6,163
Provision (benefit) for income taxes	(619)	1,995	1,114	2,273
Income (loss) before equity in net income of subsidiaries	(1,076)	(2,160)	845	3,890
Equity in net income (loss) of subsidiaries	12,730	12,302	22,068	17,620
Net income	11,654	10,142	22,913	21,510
Other comprehensive income (loss), net of taxes	10,358	(18,389)	6,241	(29,220)
Comprehensive income (loss), net	22,012	(8,247)	29,154	(7,710)
Elimination [Member]
Condensed Income Statements, Captions [Line Items]
Revenue	(7,496)	(13,228)	(15,339)	(28,063)
Cost of goods and services	(7,746)	(12,300)	(15,982)	(25,773)
Gross profit	250	(928)	643	(2,290)
Selling, general and administrative expenses	(93)	(1,054)	(185)	(2,334)
Total operating expenses	(93)		(185)	(2,334)
Income from operations	343	126	828	44
Other income (expense)
Interest income (expense), net	0	0	0	0
Loss from debt extinguishment, net		0		0
Other, net	(343)	(126)	(828)	(44)
Total other expense, net	(343)	(126)	(828)	(44)
Income before taxes	0	0	0	0
Provision (benefit) for income taxes	0	0	0	0
Income (loss) before equity in net income of subsidiaries	0	0	0	0
Equity in net income (loss) of subsidiaries	(23,275)	(21,709)	(45,802)	(44,431)
Net income	(23,275)	(21,709)	(45,802)	(44,431)
Other comprehensive income (loss), net of taxes	(12,420)	30,464	(8,442)	45,875
Comprehensive income (loss), net	$ (35,695)	$ 8,755	$ (54,244)	$ 1,444