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Debts and Letters of Credit (Details) |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Aug. 17, 2015 $ / shares | Dec. 31, 2016 USD ($) letter_of_credit | Jan. 02, 2016 USD ($) | Dec. 31, 2016 USD ($) letter_of_credit $ / shares | Jan. 02, 2016 USD ($) | Jul. 02, 2016 USD ($) | Aug. 21, 2013 USD ($)
Carrying amounts of the liability and equity components: |  |  |  |  |  |  |
Short-term debt |  | $ 0 |  | $ 0 |  | $ 0 |
Outstanding Letters of Credit |  |  |  |  |  |  |
Number of standby letters of credit | letter_of_credit |  | 12 |  | 12 |  |  |
Letters of credit outstanding |  | $ 15,200,000 |  | $ 15,200,000 |  |  |
0.625% Senior Convertible Notes |  |  |  |  |  |  |
Carrying amounts of the liability and equity components: |  |  |  |  |  |  |
Principal amount of notes |  | 650,000,000 |  | 650,000,000 |  | 650,000,000 |
Unamortized discount of liability component |  | (47,800,000) |  | (47,800,000) |  | (61,700,000) |
Unamortized debt issuance costs |  | (3,900,000) |  | (3,900,000) |  | (5,000,000) |
Carrying value of the liability component |  | 598,300,000 |  | 598,300,000 |  | 583,300,000 |
Carrying amount of equity component |  | $ 134,400,000 |  | $ 134,400,000 |  | 134,400,000 |
Aggregate principal amount of convertible debt |  |  |  |  |  |  | $ 650,000,000.0
Interest rate on senior convertible notes (as a percent) |  | 0.625% |  | 0.625% |  |  | 0.625%
Proceeds from issuance of convertible notes after issuance costs |  |  |  |  |  |  | $ 636,300,000
Conversion price of debt (in dollars per share) | $ / shares | $ 11.28 |  |  | $ 11.28 |  |  |
Fair market value of convertible debt |  | $ 672,000,000 |  | $ 672,000,000 |  | $ 633,000,000 |
Interest expense for the contractual interest and the amortization of debt discount |  |  |  |  |  |  |
Effective interest rate (as a percent) |  | 5.40% | 5.40% | 5.40% | 5.40% |  |
Interest expense-contractual interest |  | $ 1,000,000 | $ 1,000,000 | $ 2,000,000 | $ 2,000,000 |  |
Accretion of debt discount |  | $ 7,000,000 | $ 6,600,000 | $ 13,900,000 | $ 13,200,000 |  |

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