Segment Information (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Total net sales by location of customer and long-lived assets-property, plant and equipment
Consolidated net sales	$ 792,686	$ 806,961	$ 779,026	$ 827,105	$ 813,111	$ 802,829	$ 757,874	$ 789,227	$ 3,205,778	$ 3,163,041	$ 2,999,733
Consolidated long-lived assets	597,202				571,529				597,202	571,529
United States
Total net sales by location of customer and long-lived assets-property, plant and equipment
Consolidated net sales									1,934,668	2,024,178	1,938,751
Consolidated long-lived assets	399,296				397,464				399,296	397,464
U.K.
Total net sales by location of customer and long-lived assets-property, plant and equipment
Consolidated net sales									767,173	675,378	641,752
Consolidated long-lived assets	146,814				124,666				146,814	124,666
Canada
Total net sales by location of customer and long-lived assets-property, plant and equipment
Consolidated net sales									118,814	129,476	111,047
Consolidated long-lived assets	10,687				11,752				10,687	11,752
Netherlands
Total net sales by location of customer and long-lived assets-property, plant and equipment
Consolidated net sales									116,107	98,673	84,167
Consolidated long-lived assets	15,778				13,768				15,778	13,768
Ireland
Total net sales by location of customer and long-lived assets-property, plant and equipment
Consolidated net sales									40,235	36,655	33,341
Consolidated long-lived assets	4,454				5,486				4,454	5,486
Other foreign countries
Total net sales by location of customer and long-lived assets-property, plant and equipment
Consolidated net sales									228,781	198,681	190,675
Consolidated long-lived assets	$ 20,173				$ 18,393				$ 20,173	$ 18,393