Condensed Consolidating Financial Information (Details 2) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Sep. 30, 2013	Mar. 31, 2013	Sep. 30, 2012
Current assets:
Cash and cash equivalents	$ 154,233	$ 75,316	$ 63,613	$ 53,782
Trade receivables, net	84,019	109,868
Inventories	51,137	37,383
Current and deferred income taxes	14,984	14,036
Other	11,391	7,280
Total current assets	315,764	243,883
Property, plant and equipment, net	170,161	159,619
Other assets:
Goodwill	168,489	137,198
Intangible assets, net	158,531	139,797
Other	42,253	43,512
Total other assets	369,273	320,507
Total assets	855,198	724,009	724,009
Current liabilities:
Accounts payable	18,494	21,810
Accrued personnel costs	37,058	47,746
Accrued interest	19,351	16,077
Current and deferred income taxes		120
Other accrued liabilities	47,551	55,268
Current portion of long-term debt	0	7,553
Total current liabilities	122,454	148,574
Long-term liabilities:
Long-term debt	599,500	449,420
Income taxes	21,833	24,637
Other	23,901	16,968
Total long-term liabilities	645,234	491,025
Total liabilities	767,688	639,599
Non-controlling interest in consolidated subsidiary	13,376	0
Stockholders' equity:
Common stock	73	73
Capital in excess of par value	722,414	720,828
Retained earnings (accumulated deficit)	(647,718)	(635,972)
Treasury stock	(635)	(519)
Total stockholders' equity	74,134	84,410
Total liabilities and stockholders' equity	855,198	724,009
Eliminations and Reclassifications
Current assets:
Current and deferred income taxes	(25,216)	(29,687)
Total current assets	(25,216)	(29,687)
Other assets:
Investments in subsidiaries	(357,449)	(282,979)
Intercompany accounts and notes	(955,040)	(997,528)
Deferred income taxes	(74,627)	(75,407)
Total other assets	(1,387,116)	(1,355,914)
Total assets	(1,412,332)	(1,385,601)
Current liabilities:
Current and deferred income taxes	(26,942)	(29,687)
Total current liabilities	(26,942)	(29,687)
Long-term liabilities:
Income taxes	(74,627)	(75,407)
Intercompany accounts and notes	(955,040)	(997,528)
Total long-term liabilities	(1,029,667)	(1,072,935)
Total liabilities	(1,056,609)	(1,102,622)
Stockholders' equity:
Capital in excess of par value	(516,017)	(458,498)
Retained earnings (accumulated deficit)	160,294	175,519
Total stockholders' equity	(355,723)	(282,979)
Total liabilities and stockholders' equity	(1,412,332)	(1,385,601)
Guarantor Subsidiaries
Current assets:
Cash and cash equivalents	84,860	70,747
Trade receivables, net	79,604	109,868
Inventories	49,658	37,383
Current and deferred income taxes	25,138	25,828
Other	8,959	6,548
Total current assets	248,219	250,374
Property, plant and equipment, net	153,629	155,499
Other assets:
Goodwill	138,377	137,198
Intangible assets, net	133,693	139,797
Intercompany accounts and notes	317,994	360,482
Deferred income taxes	52,903	53,228
Other	14,500	22,300
Total other assets	657,467	713,005
Total assets	1,059,315	1,118,878
Current liabilities:
Accounts payable	17,268	21,051
Accrued personnel costs	8,157	14,622
Current and deferred income taxes	22,490	20,073
Other accrued liabilities	42,909	52,898
Total current liabilities	90,824	108,644
Long-term liabilities:
Income taxes	79,453	80,877
Intercompany accounts and notes	577,855	637,046
Other	12,923	9,332
Total long-term liabilities	670,231	727,255
Total liabilities	761,055	835,899
Stockholders' equity:
Capital in excess of par value	458,498	458,498
Retained earnings (accumulated deficit)	(160,238)	(175,519)
Total stockholders' equity	298,260	282,979
Total liabilities and stockholders' equity	1,059,315	1,118,878
Non-Guarantor Subsidiaries
Current assets:
Cash and cash equivalents	3,094
Trade receivables, net	4,415
Inventories	1,479
Other	146
Total current assets	9,134
Property, plant and equipment, net	10,881
Other assets:
Goodwill	30,112
Intangible assets, net	24,838
Other	903
Total other assets	55,853
Total assets	75,868
Current liabilities:
Accounts payable	727
Accrued personnel costs	849
Current and deferred income taxes	180
Other accrued liabilities	1,601
Total current liabilities	3,357
Long-term liabilities:
Intercompany accounts and notes	1,672
Total long-term liabilities	1,672
Total liabilities	5,029
Non-controlling interest in consolidated subsidiary	13,376
Stockholders' equity:
Capital in excess of par value	57,519
Retained earnings (accumulated deficit)	(56)
Total stockholders' equity	57,463
Total liabilities and stockholders' equity	75,868
Parent Company
Current assets:
Cash and cash equivalents	66,279	4,569
Current and deferred income taxes	15,062	17,895
Other	2,286	732
Total current assets	83,627	23,196
Property, plant and equipment, net	5,651	4,120
Other assets:
Investments in subsidiaries	357,449	282,979
Intercompany accounts and notes	637,046	637,046
Deferred income taxes	21,724	22,179
Other	26,850	21,212
Total other assets	1,043,069	963,416
Total assets	1,132,347	990,732
Current liabilities:
Accounts payable	499	759
Accrued personnel costs	28,052	33,124
Accrued interest	19,351	16,077
Current and deferred income taxes	4,272	9,734
Other accrued liabilities	3,041	2,370
Current portion of long-term debt		7,553
Total current liabilities	55,215	69,617
Long-term liabilities:
Long-term debt	599,500	449,420
Income taxes	17,007	19,167
Intercompany accounts and notes	375,513	360,482
Other	10,978	7,636
Total long-term liabilities	1,002,998	836,705
Total liabilities	1,058,213	906,322
Stockholders' equity:
Common stock	73	73
Capital in excess of par value	722,414	720,828
Retained earnings (accumulated deficit)	(647,718)	(635,972)
Treasury stock	(635)	(519)
Total stockholders' equity	74,134	84,410
Total liabilities and stockholders' equity	$ 1,132,347	$ 990,732