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Long-Term Debt - Additional Information (Detail) (USD $) | 9 Months Ended | 0 Months Ended | 8 Months Ended |  |  | 8 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2014 | Feb. 07, 2014 Revolving Credit Facility | Sep. 30, 2014 Revolving Credit Facility | Feb. 07, 2014 Revolving Credit Facility | Sep. 22, 2011 Revolving Credit Facility | Sep. 30, 2014 Revolving Credit Facility Minimum | Sep. 30, 2014 Revolving Credit Facility Maximum | Dec. 31, 2005 5.10% Senior Notes | Jan. 20, 2005 5.10% Senior Notes
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | $ 750,000,000.0 | $ 750,000,000.0 |  |  |  |
Additional borrowing capacity |  |  |  | 250,000,000.0 |  |  |  |  |
Interest rate margin |  |  | 1.00% |  |  | 0.90% | 1.50% |  |
Commercial paper classified as current | 355,876,000 |  |  |  |  |  |  |  |
Weighted average interest rate | 0.31% |  |  |  |  |  |  |  |
Weighted average maturity period | 20 days | 5 years |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  | $ 325,000,000.0
Maturity date |  |  |  |  |  |  |  | Feb. 01, 2015 |

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- Definition Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(a)(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13(2)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Subparagraph a(3) -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13 -Subparagraph 2 -Article 9 + Details
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