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Long-Term Debt (Details) - USD ($) $ in Millions |  |  | 3 Months Ended | 4 Months Ended | 15 Months Ended | 20 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 21, 2016 | Dec. 03, 2014 | Oct. 31, 2016 | Jul. 21, 2016 | Mar. 14, 2016 | Jul. 21, 2016 | Jul. 31, 2016 | Mar. 15, 2016
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Maturity date |  |  |  | Mar. 15, 2021 |  |  |  |
Revolving Credit Facility | Line of Credit | Minimum |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Line of Credit Facility, Commitment Fee Percentage |  |  |  | 0.15% |  |  |  |
Revolving Credit Facility | Line of Credit | Maximum |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Line of Credit Facility, Commitment Fee Percentage |  |  |  | 0.30% |  |  |  |
Credit Agreement | Revolving Credit Facility |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Outstanding borrowings |  |  | $ 341.9 |  |  |  |  |
Credit Agreement | Term Loan Facility |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Maturity date |  |  |  | Dec. 03, 2019 |  |  |  |
LIBOR variable interest rate |  |  | LIBOR rate of 0.53% plus an applicable margin of 1.25%. |  |  |  |  |
Note Purchase Agreement |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Debt issuance cost |  |  |  |  |  | $ 3.4 |  |
Debt issuance fees | $ 2.0 |  |  | $ 2.0 |  | 2.0 |  |
Reduction of long term debt | 1.4 |  |  | $ 1.4 |  | 1.4 |  |
Note Purchase Agreement | Senior Notes |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Debt instrument principal amount |  | $ 400.0 |  |  |  |  |  |
Note Purchase Agreement | Senior Notes, Series A |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Maturity date |  |  | Dec. 03, 2024 |  |  |  |  |
Debt instrument principal amount |  | $ 100.0 |  |  |  |  |  |
Debt instrument, interest rate |  | 4.07% |  |  |  |  |  |
Note Purchase Agreement | Senior Notes, Series B |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Maturity date |  |  | Dec. 03, 2026 |  |  |  |  |
Debt instrument principal amount |  | $ 100.0 |  |  |  |  |  |
Debt instrument, interest rate |  | 4.19% |  |  |  |  |  |
Note Purchase Agreement | Senior Notes, Series C |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Maturity date |  |  | Dec. 03, 2027 |  |  |  |  |
Debt instrument, interest rate |  | 4.25% |  |  |  |  |  |
Note Purchase Agreement | Senior Notes, Series D |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Maturity date |  |  | Dec. 03, 2029 |  |  |  |  |
Debt instrument principal amount |  | $ 100.0 |  |  |  |  |  |
Senior Notes, Series D | Senior Notes |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Debt instrument, interest rate |  | 4.35% |  |  |  |  |  |
Senior Notes, Series C | Senior Notes |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Debt instrument principal amount |  | $ 100.0 |  |  |  |  |  |
Federal Funds Effective Swap Rate | Credit Agreement | Revolving Credit Facility |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Applicable interest rate added to reference rate in order to compute variable interest rate |  |  | 0.50% |  |  |  |  |
London Interbank Offered Rate (LIBOR) | Credit Agreement | Revolving Credit Facility |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Applicable interest rate added to reference rate in order to compute variable interest rate |  |  | 1.00% |  |  |  |  |
London Interbank Offered Rate (LIBOR), Adjusted LIBOR One | Minimum |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Applicable interest rate added to reference rate in order to compute variable interest rate |  |  |  | 0.125% |  |  |  |
London Interbank Offered Rate (LIBOR), Adjusted LIBOR One | Maximum |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Applicable interest rate added to reference rate in order to compute variable interest rate |  |  |  | 1.00% |  |  |  |
London Interbank Offered Rate (LIBOR) Adjusted LIBOR Two | Revolving Credit Facility | Minimum |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Applicable interest rate added to reference rate in order to compute variable interest rate |  |  |  | 1.125% |  |  |  |
Wells Fargo and Bank of America, N.A. | Line of Credit |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Repayments of Lines of Credit | 242.5 |  |  |  |  |  |  |
Wells Fargo and Bank of America, N.A. | Term Loan Facility | Line of Credit |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Quarterly amortization for term loan |  |  |  | $ 7.5 |  |  |  |
Wells Fargo and Bank of America, N.A. | Credit Agreement | Revolving Credit Facility |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  | 300.0 |  |  |  |  |  |
Wells Fargo and Bank of America, N.A. | Credit Agreement | Term Loan Facility |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  | $ 300.0 |  |  |  |  |  |
Wells Fargo and Bank of America, N.A. | Credit Agreement | Term Loan Facility | Line of Credit |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Quarterly amortization for term loan |  |  |  |  | $ 18.8 |  |  |
Wells Fargo and Bank of America, N.A. | First Amendment To Credit Agreement | Revolving Credit Facility |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  | $ 350.0
Line of Credit, Maximum Borrowing Capacity, Increase |  |  |  |  |  |  |  | 50.0
Wells Fargo and Bank of America, N.A. | First Amendment To Credit Agreement | Term Loan Facility |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  | 93.8
Outstanding borrowings |  |  |  |  |  |  |  | $ 93.8
Wells Fargo and Bank of America, N.A. | London Interbank Offered Rate (LIBOR) Adjusted LIBOR Two | Revolving Credit Facility | Maximum |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Applicable interest rate added to reference rate in order to compute variable interest rate |  |  |  | 2.00% |  |  |  |
WellsFargo,NationalAssociation,SunTrustBankandBankofAmerica,N.A. |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Maturity date |  |  | Jul. 21, 2021 |  |  |  |  |
WellsFargo,NationalAssociation,SunTrustBankandBankofAmerica,N.A. | Revolving Credit Facility | Minimum |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Line of Credit Facility, Commitment Fee Percentage |  |  | 0.125% |  |  |  |  |
WellsFargo,NationalAssociation,SunTrustBankandBankofAmerica,N.A. | Revolving Credit Facility | Maximum |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Line of Credit Facility, Commitment Fee Percentage |  |  | 0.20% |  |  |  |  |
WellsFargo,NationalAssociation,SunTrustBankandBankofAmerica,N.A. | Revolving Credit Facility | Line of Credit |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Outstanding borrowings |  |  |  |  |  |  | $ 238.0 |
WellsFargo,NationalAssociation,SunTrustBankandBankofAmerica,N.A. | Second Amendment To Credit Agreement | Revolving Credit Facility |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity | $ 500.0 |  | $ 850.0 | $ 500.0 |  | $ 500.0 |  |
WellsFargo,NationalAssociation,SunTrustBankandBankofAmerica,N.A. | London Interbank Offered Rate (LIBOR), Adjusted LIBOR One | Revolving Credit Facility | Minimum |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Applicable interest rate added to reference rate in order to compute variable interest rate |  |  | 0.00% |  |  |  |  |
WellsFargo,NationalAssociation,SunTrustBankandBankofAmerica,N.A. | London Interbank Offered Rate (LIBOR), Adjusted LIBOR One | Revolving Credit Facility | Maximum |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Applicable interest rate added to reference rate in order to compute variable interest rate |  |  | 0.75% |  |  |  |  |
WellsFargo,NationalAssociation,SunTrustBankandBankofAmerica,N.A. | London Interbank Offered Rate (LIBOR) Adjusted LIBOR Two | Revolving Credit Facility | Minimum |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Applicable interest rate added to reference rate in order to compute variable interest rate |  |  | 1.00% |  |  |  |  |
WellsFargo,NationalAssociation,SunTrustBankandBankofAmerica,N.A. | London Interbank Offered Rate (LIBOR) Adjusted LIBOR Two | Revolving Credit Facility | Maximum |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Applicable interest rate added to reference rate in order to compute variable interest rate |  |  | 1.75% |  |  |  |  |

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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + 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(a)(1)) -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 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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