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Borrowing Arrangements (Detail) - USD ($) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2015 | Dec. 31, 2012 | Jan. 31, 2017 | Jan. 31, 2016
Debt Disclosure [Line Items] |  |  |  |
Unsecured revolving credit facility |  |  | $ 400,000,000 |
Unsecured revolving credit facility, option to request an increase in the amount of the credit facility up to |  |  | $ 100,000,000.0 |
Line of credit facility, expiration |  |  | May 31, 2020 |
Line of credit facility, outstanding borrowings |  |  | $ 0 | $ 0
Senior Notes | Senior Notes due 2020 |  |  |  |
Debt Disclosure [Line Items] |  |  |  |
Face amount | $ 450,000,000 |  |  |
Stated interest rate | 3.125% |  |  |
Maturity date | Jun. 15, 2020 |  |  |
Senior Notes | Senior Notes due 2025 |  |  |  |
Debt Disclosure [Line Items] |  |  |  |
Face amount | $ 300,000,000 |  |  |
Stated interest rate | 4.375% |  |  |
Maturity date | Jun. 15, 2025 |  |  |
Senior Notes | 2015 Senior Notes |  |  |  |
Debt Disclosure [Line Items] |  |  |  |
Proceeds from debt, net of issuance costs | $ 742,000,000 |  |  |
Unamortized discount | 1,700,000 |  |  |
Debt issuance costs | $ 6,300,000 |  |  |
Debt redemption percentage of principle amount (as a percent) | 101.00% |  |  |
Fair value disclosure |  |  | 768,100,000 |
Senior Notes | Senior Notes due 2017 |  |  |  |
Debt Disclosure [Line Items] |  |  |  |
Face amount |  | $ 400,000,000 |  |
Stated interest rate |  | 1.95% |  |
Maturity date |  | Dec. 15, 2017 |  |
Senior Notes | Senior Notes due 2022 |  |  |  |
Debt Disclosure [Line Items] |  |  |  |
Face amount |  | $ 350,000,000 |  |
Stated interest rate |  | 3.60% |  |
Maturity date |  | Dec. 15, 2022 |  |
Senior Notes | 2012 Senior Notes |  |  |  |
Debt Disclosure [Line Items] |  |  |  |
Proceeds from debt, net of issuance costs |  | $ 739,300,000 |  |
Unamortized discount |  | 4,500,000 |  |
Debt issuance costs |  | $ 6,100,000 |  |
Debt redemption percentage of principle amount (as a percent) |  | 101.00% |  |
Fair value disclosure |  |  | $ 758,600,000 |

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: 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(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 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(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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