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Long-Term Debt (Details) - USD ($) |  | 6 Months Ended | 12 Months Ended | 47 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 03, 2014 | Jan. 31, 2016 | Jan. 31, 2015 | Dec. 31, 2015 | Dec. 03, 2019 | Sep. 29, 2011 | Dec. 14, 2010
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Debt issuance cost |  | $ 0 | $ 955,000 |  |  |  |
Revolving Loan Facility [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  | $ 100,000,000
Term Loan Facility [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  | $ 500,000,000 | 400,000,000
Maturity date |  | Dec. 03, 2019 |  |  |  |  |
Alternative currency borrowing credit facility [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  | 100,000,000
Letter of Credit [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  | $ 50,000,000
Credit Agreement [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Line of credit facility amount paid | $ 275,000,000 |  |  |  |  |  |
Maturity date |  | Dec. 03, 2019 |  |  |  |  |
Credit Agreement [Member] | Revolving Loan Facility [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity | 300,000,000 |  |  |  |  |  |
Outstanding borrowings | 0 | $ 68,000,000 |  |  |  |  |
Credit Agreement [Member] | Revolving Loan Facility [Member] | Minimum [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Commitment fee percentage |  | 0.20% |  |  |  |  |
Credit Agreement [Member] | Revolving Loan Facility [Member] | Maximum [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Commitment fee percentage |  | 0.35% |  |  |  |  |
Credit Agreement [Member] | Term Loan Facility [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity | 300,000,000 |  |  |  |  |  |
Outstanding borrowings |  | $ 206,300,000 |  |  |  |  |
Maturity date |  | Dec. 31, 2015 |  |  |  |  |
Quarterly amortization for term loan |  |  |  | $ 18,800,000 |  |  |
LIBOR variable interest rate |  | LIBOR rate of 0.43% plus an applicable margin of 1.25%. |  |  |  |  |
Note Purchase Agreement [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Debt issuance cost |  | $ 2,100,000 |  |  |  |  |
Debt issuance fees |  | 1,000,000 |  |  |  |  |
Reduction of long term debt |  | $ 1,100,000 |  |  |  |  |
Note Purchase Agreement [Member] | Senior Notes [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Debt instrument principal amount | 400,000,000 |  |  |  |  |  |
Note Purchase Agreement [Member] | Senior Notes, Series A [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Maturity date |  | Dec. 03, 2024 |  |  |  |  |
Debt instrument principal amount | $ 100,000,000 |  |  |  |  |  |
Debt instrument, interest rate | 4.07% |  |  |  |  |  |
Note Purchase Agreement [Member] | Senior Notes, Series B [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Maturity date |  | Dec. 03, 2026 |  |  |  |  |
Debt instrument principal amount | $ 100,000,000 |  |  |  |  |  |
Debt instrument, interest rate | 4.19% |  |  |  |  |  |
Note Purchase Agreement [Member] | Senior Notes, Series C [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Maturity date |  | Dec. 03, 2027 |  |  |  |  |
Debt instrument principal amount | $ 100,000,000 |  |  |  |  |  |
Debt instrument, interest rate | 4.25% |  |  |  |  |  |
Note Purchase Agreement [Member] | Senior Notes, Series D [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Maturity date |  | Dec. 03, 2029 |  |  |  |  |
Debt instrument principal amount | $ 100,000,000 |  |  |  |  |  |
Debt instrument, interest rate | 4.35% |  |  |  |  |  |
Scenario, Forecast [Member] | Credit Agreement [Member] | Term Loan Facility [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Quarterly amortization for term loan |  |  |  |  | $ 7,500,000 |  |
Federal Funds Effective Swap Rate [Member] | Credit Agreement [Member] | Revolving Loan Facility [Member] |  |  |  |  |  |  |
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) [Member] | Credit Agreement [Member] | Revolving Loan Facility [Member] |  |  |  |  |  |  |
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 [Member] | Credit Agreement [Member] | Revolving Loan Facility [Member] | Minimum [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Applicable interest rate added to reference rate in order to compute variable interest rate |  | 0.25% |  |  |  |  |
London Interbank Offered Rate (LIBOR), Adjusted LIBOR One [Member] | Credit Agreement [Member] | Revolving Loan Facility [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Credit Agreement [Member] | Revolving Loan Facility [Member] | Minimum [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Applicable interest rate added to reference rate in order to compute variable interest rate |  | 1.25% |  |  |  |  |
London Interbank Offered Rate (LIBOR) Adjusted LIBOR Two [Member] | Credit Agreement [Member] | Revolving Loan Facility [Member] | Maximum [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Applicable interest rate added to reference rate in order to compute variable interest rate |  | 2.00% |  |  |  |  |

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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 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3291-108585 + Details
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