Aclara Divestiture (Narrative) (Details) (USD $)	3 Months Ended								12 Months Ended			1 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	Mar. 28, 2014 Aclara Technologies LLC [Member]	Sep. 30, 2014 Aclara Technologies LLC [Member]	Sep. 30, 2013 Aclara Technologies LLC [Member]	Sep. 30, 2012 Aclara Technologies LLC [Member]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax													$ (48,200,000)	$ (62,100,000)	$ 19,500,000
Net sales	151,413,000	130,495,000	124,762,000	124,450,000	144,600,000	116,922,000	118,039,000	110,518,000	531,120,000	490,079,000	478,699,000		129,600,000	184,500,000	209,700,000
Proceeds from Divestiture of Businesses, Net of Cash Divested, Total												135,000,000
Noncash or Part Noncash Divestiture, Amount of Consideration Received												10,000,000
Noncash Or Part Noncash Divestiture Type Of Consideration Received												5,000,000
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax, Total									(52,061,000)	0	0		63,800,000	48,000,000
Receivables, Net, Current	1,500,000								1,500,000				8,500,000
Operating Loss Carryforwards, Valuation Allowance	300,000				400,000				300,000	400,000
Discontinued Operation Loss on Disposal of Discontinued Operation									$ 15,600,000