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Aclara Divestiture (Narrative) (Details) (USD $) | 3 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended
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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 |  |  |  |  |  |

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- Definition The type of noncash consideration received (for example, debt, stock, etc.) Noncash is defined as transactions during a period that affect recognized assets or liabilities, but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References No definition available. + Details
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- Definition Amount of gain (loss), after tax expense or benefit and not previously recognized, resulting from the sale of a business component. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e957-107759 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
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- Definition Overall income (loss) from a disposal group that is classified as a component of the entity, before income tax, reported as a separate component of income before extraordinary items. Includes the following (before income tax): income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e957-107759 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.12) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 13 -Article 7 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 05 -Paragraph 15 -Article 3 + Details
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- Definition The portion of the valuation allowance pertaining to the deferred tax asset representing potential future taxable deductions from net operating loss carryforwards for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 30 -Paragraph 5 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=6907311&loc=d3e30536-109315 + Details
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