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Debt - Senior Credit Agreement (Details) |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 15, 2015 USD ($) | Jul. 27, 2019 USD ($) | Jul. 27, 2019 USD ($) | Jan. 26, 2019 USD ($) | Oct. 19, 2018 USD ($)
Line of Credit Facility [Line Items] |  |  |  |  |
Letters of credit outstanding amount |  | $ 52,300,000 | $ 52,300,000 | $ 48,600,000 |
Additional borrowing availability |  | 276,500,000 | 276,500,000 | 412,900,000 |
Standby Letters of Credit |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Line of credit maximum borrowing capacity |  |  |  |  | $ 200,000,000.0
Letters of credit outstanding amount |  | 52,300,000 | 52,300,000 | $ 48,600,000 |
Incremental Facility, Minimum |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt instrument, face amount | $ 350,000,000.0 |  |  |  |
Credit Agreement - Term Loan (matures April 2020) |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Line of credit maximum borrowing capacity |  |  |  |  | 450,000,000.0
Debt instrument, covenant compliance, consolidated leverage ratio, maximum | 2.25 |  |  |  |
Unrestricted cash and cash equivalents threshold |  | $ 50,000,000.0 | $ 50,000,000.0 |  |
Credit Agreement - Revolving facility (matures April 2020) |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Line of credit maximum borrowing capacity | $ 450,000,000.0 |  |  |  | $ 750,000,000.0
Unutilized commitment fee (in percent) |  |  | 0.35% | 0.35% |
Minimum |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt instrument, covenant compliance, consolidated leverage ratio, maximum |  | 3.50 |  |  |
Debt instrument, covenant compliance, consolidated interest coverage ratio, maximum |  | 3.00 |  |  |
Minimum | Standby Letters of Credit |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Unutilized commitment fee (in percent) |  |  | 1.25% |  |
Minimum | Credit Agreement - Revolving facility (matures April 2020) |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Unutilized commitment fee (in percent) |  |  | 0.20% |  |
Maximum |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt instrument, covenant compliance, consolidated leverage ratio, maximum |  | 1.00 |  |  |
Debt instrument, covenant compliance, consolidated interest coverage ratio, maximum |  | 1.00 |  |  |
Maximum | Standby Letters of Credit |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Unutilized commitment fee (in percent) |  |  | 2.00% |  |
Maximum | Credit Agreement - Revolving facility (matures April 2020) |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Unutilized commitment fee (in percent) |  |  | 0.40% |  |
0.75% Convertible Senior Notes Due 2021 |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt instrument, face amount | $ 485,000,000.0 | $ 485,000,000 | $ 485,000,000 | $ 485,000,000 |
Outstanding debt threshold |  | 250,000,000.0 | 250,000,000.0 |  |
Credit agreement liquidity requirement |  | $ 150,000,000.0 | $ 150,000,000.0 |  |

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- Definition Debt Instrument, Covenant Compliance, Consolidated Interest Coverage Ratio + References No definition available. + Details
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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 The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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