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Goodwill and Intangible Assets - Intangible Assets (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified | 1 Months Ended | 9 Months Ended | 1 Months Ended |
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Aug. 31, 2013 | Mar. 31, 2013 | Sep. 30, 2013 | Sep. 30, 2012 | Aug. 31, 2013 Completed Technology [Member] | Jun. 30, 2013 Alter Power Systems [Member] | Mar. 31, 2013 Alter Power Systems [Member] | Mar. 12, 2013 Alter Power Systems [Member] | Mar. 31, 2013 Alter Power Systems [Member] Completed Technology [Member] | Mar. 31, 2013 Alter Power Systems [Member] Trade Names [Member]
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Acquisition purchase price |  |  | $ 2,326 | $ 24,385 |  | $ 2,058 | $ 2,426 | $ 2,426 |  |
Completed technology of net assets | 268 | 2,806 |  |  | 388 |  |  |  |  |
Intangible asset in connection with acquisition |  |  |  |  |  |  | $ 2,806 |  | $ 2,208 | $ 598

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- Definition The amount of identifiable intangible assets recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=25498275&loc=d3e2207-128464 + Details
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- Definition Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, resulting from a business combination. + References No definition available. + Details
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- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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