Condensed Consolidating Financial Information (Details 2) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Current assets:
Cash and cash equivalents	$ 152,542	$ 75,316	$ 53,782	$ 50,810
Trade receivables, net	119,330	109,868
Inventories	50,633	37,383
Deferred income taxes	11,076	14,036
Other	10,536	7,280
Total current assets	344,117	243,883
Property, plant and equipment, net	182,111	159,619
Other assets:
Goodwill	175,586	137,198	116,671
Intangible assets, net	159,863	139,797
Other	41,750	43,512
Total other assets	377,199	320,507
Total assets	903,427	724,009	680,937
Current liabilities:
Accounts payable	27,026	21,810
Accrued personnel costs	48,902	47,746
Accrued interest	18,273	16,077
Current and deferred income taxes	368	120
Other accrued liabilities	41,757	55,268
Current portion of long-term debt	0	7,553
Total current liabilities	136,326	148,574
Long-term liabilities:
Long-term debt	599,579	449,420
Income taxes	23,242	24,637
Other	28,586	16,968
Total long-term liabilities	651,407	491,025
Total liabilities	787,733	639,599
Redeemable non-controlling interest in consolidated subsidiary	13,252	0
Stockholders' equity:
Common stock	74	73
Capital in excess of par value	723,648	720,828
Retained earnings (accumulated deficit)	(620,688)	(635,972)
Treasury stock	(592)	(519)
Total stockholders' equity	102,442	84,410	(3,129)	56,736
Total liabilities and stockholders' equity	903,427	724,009
Consolidation, Eliminations
Current assets:
Deferred income taxes	(23,149)	(29,687)
Total current assets	(23,149)	(29,687)
Property, plant and equipment, net	0	0
Other assets:
Investments in subsidiaries	(406,327)	(282,979)
Intercompany accounts and notes	(1,018,127)	(997,528)
Deferred income taxes	(64,586)	(75,407)
Total other assets	(1,489,040)	(1,355,914)
Total assets	(1,512,189)	(1,385,601)
Current liabilities:
Current and deferred income taxes	(23,149)	(29,687)
Total current liabilities	(23,149)	(29,687)
Long-term liabilities:
Income taxes	(64,586)	(75,407)
Intercompany accounts and notes	(1,018,127)	(997,528)
Total long-term liabilities	(1,082,713)	(1,072,935)
Total liabilities	(1,105,862)	(1,102,622)
Stockholders' equity:
Capital in excess of par value	(519,127)	(458,498)
Retained earnings (accumulated deficit)	112,800	175,519
Total stockholders' equity	(406,327)	(282,979)
Total liabilities and stockholders' equity	(1,512,189)	(1,385,601)
Guarantor Subsidiaries | Reportable Legal Entities
Current assets:
Cash and cash equivalents	33,552	70,747	44,111	36,122
Trade receivables, net	113,940	109,868
Inventories	48,482	37,383
Deferred income taxes	15,509	25,828
Other	9,286	6,548
Total current assets	220,769	250,374
Property, plant and equipment, net	162,458	155,499
Other assets:
Goodwill	145,068	137,198
Intangible assets, net	131,150	139,797
Intercompany accounts and notes	381,082	360,482
Deferred income taxes	41,658	53,228
Other	14,388	22,300
Total other assets	713,346	713,005
Total assets	1,096,573	1,118,878
Current liabilities:
Accounts payable	25,643	21,051
Accrued personnel costs	13,483	14,622
Current and deferred income taxes	23,198	20,073
Other accrued liabilities	36,811	52,898
Total current liabilities	99,135	108,644
Long-term liabilities:
Income taxes	65,133	80,877
Intercompany accounts and notes	572,356	637,046
Other	16,167	9,332
Total long-term liabilities	653,656	727,255
Total liabilities	752,791	835,899
Stockholders' equity:
Capital in excess of par value	458,498	458,498
Retained earnings (accumulated deficit)	(114,716)	(175,519)
Total stockholders' equity	343,782	282,979
Total liabilities and stockholders' equity	1,096,573	1,118,878
Non-Guarantor Subsidiaries | Reportable Legal Entities
Current assets:
Cash and cash equivalents	5,764	34
Trade receivables, net	5,390
Inventories	2,151
Deferred income taxes	289
Other	168
Total current assets	13,762
Property, plant and equipment, net	11,674
Other assets:
Goodwill	30,518
Intangible assets, net	28,713
Other	1,381
Total other assets	60,612
Total assets	86,048
Current liabilities:
Accounts payable	956
Accrued personnel costs	418
Current and deferred income taxes	319
Other accrued liabilities	3,006
Total current liabilities	4,699
Long-term liabilities:
Income taxes	893
Intercompany accounts and notes	4,061
Other	774
Total long-term liabilities	5,728
Total liabilities	10,427
Redeemable non-controlling interest in consolidated subsidiary	13,252
Stockholders' equity:
Capital in excess of par value	60,453
Retained earnings (accumulated deficit)	1,916
Total stockholders' equity	62,369
Total liabilities and stockholders' equity	86,048
Parent Company | Reportable Legal Entities
Current assets:
Cash and cash equivalents	113,226	4,569	9,671	14,688
Deferred income taxes	18,427	17,895
Other	1,082	732
Total current assets	132,735	23,196
Property, plant and equipment, net	7,979	4,120
Other assets:
Investments in subsidiaries	406,327	282,979
Intercompany accounts and notes	637,045	637,046
Deferred income taxes	22,928	22,179
Other	25,981	21,212
Total other assets	1,092,281	963,416
Total assets	1,232,995	990,732
Current liabilities:
Accounts payable	427	759
Accrued personnel costs	35,001	33,124
Accrued interest	18,273	16,077
Current and deferred income taxes		9,734
Other accrued liabilities	1,940	2,370
Current portion of long-term debt		7,553
Total current liabilities	55,641	69,617
Long-term liabilities:
Long-term debt	599,579	449,420
Income taxes	21,802	19,167
Intercompany accounts and notes	441,710	360,482
Other	11,645	7,636
Total long-term liabilities	1,074,736	836,705
Total liabilities	1,130,377	906,322
Stockholders' equity:
Common stock	74	73
Capital in excess of par value	723,824	720,828
Retained earnings (accumulated deficit)	(620,688)	(635,972)
Treasury stock	(592)	(519)
Total stockholders' equity	102,618	84,410
Total liabilities and stockholders' equity	$ 1,232,995	$ 990,732