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		9 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Condensed Income Statements, Captions [Line Items]
Operating Expenses	$ 90,740	$ 94,780	$ 272,972	$ 277,665
Revenue	473,320	462,200	1,436,184	1,456,456
Cost of goods and services	357,363	342,843	1,088,550	1,106,837
Gross profit	115,957	119,357	347,634	349,619
Selling, general and administrative expenses	90,740	88,880	272,972	271,765
Restructuring and other related charges		5,900		5,900
Restructuring and other related charges	0	5,900	0	5,900
Income from operations	25,217	24,577	74,662	71,954
Other income (expense)
Interest income (expense), net	(12,712)	(12,960)	(38,701)	(37,320)
Other, net	(935)	142	(1,176)	312
Total other expense, net	(13,647)	(12,818)	(39,877)	(37,008)
Income before taxes	11,570	11,759	34,785	34,946
Provision (benefit) for income taxes	2,017	4,163	7,923	10,467
Income (loss) before equity in net income of subsidiaries	9,553	7,596	26,862	24,479
Equity in net income (loss) of subsidiaries	0	0	0	0
Net income	9,553	7,596	26,862	24,479
Foreign currency translation adjustments	6,414	796	1,344	11,130
Other comprehensive income (loss), net of taxes	7,156	2,469	3,777	10,911
Comprehensive income (loss), net	16,709	10,065	30,639	35,390
Parent Company [Member]
Condensed Income Statements, Captions [Line Items]
Operating Expenses		6,646		19,574
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	7,038	6,646	20,759	19,574
Restructuring and other related charges		0		0
Income from operations	(7,038)	(6,646)	(20,759)	(19,574)
Other income (expense)
Interest income (expense), net	(3,267)	(3,347)	(10,616)	(8,299)
Other, net	55	67	216	278
Total other expense, net	(3,212)	(3,280)	(10,400)	(8,021)
Income before taxes	(10,250)	(9,926)	(31,159)	(27,595)
Provision (benefit) for income taxes	(6,080)	12,946	(16,643)	1,307
Income (loss) before equity in net income of subsidiaries	(4,170)	(22,872)	(14,516)	(28,902)
Equity in net income (loss) of subsidiaries	13,723	30,468	41,378	53,381
Net income	9,553	7,596	26,862	24,479
Other comprehensive income (loss), net of taxes	7,156	2,469	3,777	10,911
Comprehensive income (loss), net	16,709	10,065	30,639	35,390
Guarantor Companies [Member]
Condensed Income Statements, Captions [Line Items]
Operating Expenses		66,034		198,178
Revenue	376,143	369,235	1,132,641	1,165,484
Cost of goods and services	283,552	267,804	859,990	879,391
Gross profit	92,591	101,431	272,651	286,093
Selling, general and administrative expenses	65,146	64,735	194,377	196,879
Restructuring and other related charges		1,299		1,299
Income from operations	27,445	35,397	78,274	87,915
Other income (expense)
Interest income (expense), net	(8,248)	(7,656)	(24,539)	(23,197)
Other, net	572	714	2,131	2,634
Total other expense, net	(7,676)	(6,942)	(22,408)	(20,563)
Income before taxes	19,769	28,455	55,866	67,352
Provision (benefit) for income taxes	6,910	7,167	20,006	23,996
Income (loss) before equity in net income of subsidiaries	12,859	21,288	35,860	43,356
Equity in net income (loss) of subsidiaries	913	7,454	5,633	8,275
Net income	13,772	28,742	41,493	51,631
Other comprehensive income (loss), net of taxes	3,688	(2,652)	(4,219)	(451)
Comprehensive income (loss), net	17,460	26,090	37,274	51,180
Non-Guarantor Companies [Member]
Condensed Income Statements, Captions [Line Items]
Operating Expenses		22,192		60,190
Revenue	103,905	100,420	327,325	313,766
Cost of goods and services	81,082	82,914	253,406	251,303
Gross profit	22,823	17,506	73,919	62,463
Selling, general and administrative expenses	18,648	17,591	58,113	55,589
Restructuring and other related charges		4,601		4,601
Income from operations	4,175	(4,686)	15,806	2,273
Other income (expense)
Interest income (expense), net	(1,197)	(1,957)	(3,546)	(5,824)
Other, net	(927)	(127)	(2,182)	(1,260)
Total other expense, net	(2,124)	(2,084)	(5,728)	(7,084)
Income before taxes	2,051	(6,770)	10,078	(4,811)
Provision (benefit) for income taxes	1,187	(15,950)	4,560	(14,836)
Income (loss) before equity in net income of subsidiaries	864	9,180	5,518	10,025
Equity in net income (loss) of subsidiaries	12,859	21,288	35,860	43,356
Net income	13,723	30,468	41,378	53,381
Other comprehensive income (loss), net of taxes	9,992	4,920	15,346	11,161
Comprehensive income (loss), net	23,715	35,388	56,724	64,542
Elimination [Member]
Condensed Income Statements, Captions [Line Items]
Operating Expenses		(92)		(277)
Revenue	(6,728)	(7,455)	(23,782)	(22,794)
Cost of goods and services	(7,271)	(7,875)	(24,846)	(23,857)
Gross profit	543	420	1,064	1,063
Selling, general and administrative expenses	(92)	(92)	(277)	(277)
Restructuring and other related charges		0		0
Income from operations	635	512	1,341	1,340
Other income (expense)
Interest income (expense), net	0	0	0	0
Other, net	(635)	(512)	(1,341)	(1,340)
Total other expense, net	(635)	(512)	(1,341)	(1,340)
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	(27,495)	(59,210)	(82,871)	(105,012)
Net income	(27,495)	(59,210)	(82,871)	(105,012)
Other comprehensive income (loss), net of taxes	(13,680)	(2,268)	(11,127)	(10,710)
Comprehensive income (loss), net	$ (41,175)	$ (61,478)	$ (93,998)	$ (115,722)