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Debt - Senior Credit Agreement (Details) |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 15, 2015 USD ($) | Jan. 26, 2019 USD ($) | Jan. 25, 2020 USD ($) | Oct. 19, 2018 USD ($)
Line of Credit Facility [Line Items] |  |  |  |
Letters of credit outstanding amount |  | $ 48,600,000 | $ 52,300,000 |
Line of Credit Facility, Remaining Borrowing Capacity |  | 412,900,000 | 287,000,000.0 |
Incremental Facility, Minimum |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Debt instrument, face amount | $ 350,000,000.0 |  |  |
Standby Letters of Credit |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  | $ 200,000,000.0
Letters of credit outstanding amount |  |  | 48,600,000 |
0.75% Convertible Senior Notes Due 2021 |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Debt instrument, face amount | $ 485,000,000.0 | $ 485,000,000 | $ 460,000,000.0 |
Debt, interest rate (in percent) |  | 0.75% | 0.75% |
Outstanding Debt Credit Agreement Threshold |  |  | $ 250,000,000.0 |
Credit Agreement Liquidity Requirement |  |  | 150,000,000.0 |
Minimum |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Debt Instrument, Covenant Compliance, Consolidated Leverage Ratio |  | 3.50 |  |
Debt Instrument, Covenant Compliance, Consolidated Interest Coverage Ratio |  | 3.00 |  |
Maximum |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Debt Instrument, Covenant Compliance, Consolidated Leverage Ratio |  | 1.00 |  |
Debt Instrument, Covenant Compliance, Consolidated Interest Coverage Ratio |  | 1.00 |  |
Credit Agreement - Term Loan (matures April 2020) |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  | 450,000,000.0
Unrestricted Cash and Cash Equivalents Credit Agreement Threshold |  |  | $ 50,000,000.0 |
Debt Instrument, Covenant Compliance, Consolidated Leverage Ratio | 2.25 |  |  |
Credit Agreement - Revolving facility (matures April 2020) |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 450,000,000.0 |  |  | $ 750,000,000.0

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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