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Long-Term Debt (Details) - USD ($) $ in Millions |  | 4 Months Ended | 9 Months Ended | 15 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jul. 21, 2016 | Jul. 21, 2016 | Apr. 30, 2020 | Mar. 14, 2016 | Apr. 30, 2017 | Mar. 15, 2016 | Dec. 03, 2014
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Maturity date |  | Mar. 15, 2021 |  |  |  |  |
Scenario 3 |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Long-term Debt |  |  | not to exceed $50.0 million |  |  |  |
Scenario 4 |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Long-term Debt |  |  | not less than $75.0 million |  |  |  |
Credit Agreement | Term Loan Facility |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Maturity date |  | Dec. 03, 2019 |  |  |  |  |
Note Purchase Agreement | Senior Notes |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  | $ 400.0
Note Purchase Agreement | Senior Notes, Series A |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Debt instrument, interest rate |  |  |  |  |  |  | 4.07%
Note Purchase Agreement | Senior Notes, Series B |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Debt instrument, interest rate |  |  |  |  |  |  | 4.19%
Note Purchase Agreement | Senior Notes, Series C |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Debt instrument, interest rate |  |  |  |  |  |  | 4.25%
Note Purchase Agreement | Senior Notes, Series D |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Debt instrument, interest rate |  |  |  |  |  |  | 4.35%
Senior Notes, Series A [Member] | Senior Notes |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  | $ 100.0
Senior Notes, Series B [Member] | Senior Notes |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  | 100.0
Senior Notes, Series C [Member] | Senior Notes |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  | 100.0
Senior Notes, Series D [Member] | Senior Notes |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  | 100.0
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. | Revolving Credit Facility | Line of Credit | Minimum |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Line of Credit Facility, Commitment Fee Percentage |  | 0.15% |  |  |  |  |
Wells Fargo and Bank of America, N.A. | Revolving Credit Facility | Line of Credit | Maximum |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Line of Credit Facility, Commitment Fee Percentage |  | 0.30% |  |  |  |  |
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 One | Minimum |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Applicable interest rate added to reference rate in order to compute variable interest rate |  | 0.125% |  |  |  |  |
Wells Fargo and Bank of America, N.A. | 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% |  |  |  |  |
Wells Fargo and Bank of America, 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 |  | 1.125% |  |  |  |  |
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 |  |  | $ 0.0 |  |  |  |
WellsFargo,NationalAssociation,SunTrustBankandBankofAmerica,N.A. | Scenario 3 |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Line of Credit Facility, Covenant Terms |  |  | not to exceed $50.0 million |  |  |  |
WellsFargo,NationalAssociation,SunTrustBankandBankofAmerica,N.A. | Scenario 4 |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Line of Credit Facility, Covenant Terms |  |  | not less than $75.0 million |  |  |  |
WellsFargo,NationalAssociation,SunTrustBankandBankofAmerica,N.A. | Credit Agreement | Term Loan Facility |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
LIBOR variable interest rate |  |  | LIBOR Rate of 0.33% plus an applicable margin of 1.00%. |  |  |  |
WellsFargo,NationalAssociation,SunTrustBankandBankofAmerica,N.A. | Second Amendment To Credit Agreement | Revolving Credit Facility |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity | $ 500.0 | $ 500.0 |  |  | $ 850.0 |  |
WellsFargo,NationalAssociation,SunTrustBankandBankofAmerica,N.A. | 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% |  |  |  |
WellsFargo,NationalAssociation,SunTrustBankandBankofAmerica,N.A. | 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% |  |  |  |
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 Description of minimum financial levels (for example, tangible net worth and working capital) and achievement of certain financial ratios (for example, working capital ratio and debt service coverage ratio), and adherence to certain clauses which generally require or restrict certain actions (for example, entering into a debt arrangement with equal or greater seniority, and selling or discontinuing a certain business segment or material subsidiary) to be in compliance with the covenant clauses of the debt agreement. May also include a discussion of the adverse consequences that would result if the entity violates or fails to satisfy the covenants. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 + 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://fasb.org/us-gaap/role/ref/legacyRef -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=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=120398452&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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=120400017&loc=d3e572229-122910 + Details
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