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Debt - 1.75% Convertible Senior Notes ("2023 Notes) (Narrative) (Details) |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
May 29, 2018 USD ($) day $ / shares | Mar. 30, 2019 | Jun. 29, 2019 USD ($) $ / shares | Jun. 30, 2018 USD ($) | Jul. 01, 2017 USD ($)
Debt Instrument [Line Items] |  |  |  |  |
Proceeds from issuance of senior convertible debt |  |  | $ 0 | $ 225,000,000.0 | $ 460,000,000.0
Convertible Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Carrying value of liability component |  |  | 578,800,000 | 833,200,000 |
Carrying value of the equity component of convertible debt |  |  | 136,800,000 | 239,100,000 |
Unamortized debt issuance cost |  |  | $ 6,400,000 | $ 7,700,000 |
Convertible Debt | 2023 Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate on senior convertible notes | 1.75% |  | 1.75% | 1.75% |
Face amount of senior convertible notes | $ 225,000,000.0 |  |  |  |
Effective rate | 5.30% |  |  |  |
Swap rate term | 5 years |  |  |  |
Initial conversion price (usd per share) | $ / shares | $ 13.94 |  | $ 13.94 |  |
Premium to closing sale price of common stock (percent) | 37.50% |  |  |  |
Threshold closing price as a percentage of conversion price | 130.00% |  |  |  |
Threshold trading days (days) | day | 20 |  |  |  |
Threshold consecutive trading days (days) | day | 30 |  |  |  |
Threshold consecutive business days (days) | day | 5 |  |  |  |
Threshold consecutive trading days during which the the trading price was less than 98% of the product of the closing sale price and the applicable conversion rate (days) | day | 10 |  |  |  |
Threshold percentage of stock price trigger | 98.00% |  |  |  |
Fundamental change in price (percent) | 100.00% |  |  |  |
Redemption price (percent) | 100.00% |  |  |  |
Carrying value of liability component | $ 190,100,000 |  |  |  |
Carrying value of the equity component of convertible debt | 34,900,000 |  |  |  |
Expected remaining term of Notes |  | 3 years 10 months 24 days |  |  |
Issuance costs | 2,200,000 |  |  |  |
Unamortized debt issuance cost |  |  | $ 1,500,000 |  |
Fair value of Notes |  |  | $ 261,300,000 | $ 232,400,000 |
Convertible Debt | Liability component |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Issuance costs | 1,900,000 |  |  |  |
Convertible Debt | Equity component |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Issuance costs | 300,000 |  |  |  |
Exchange Transaction | Convertible Debt | 2023 Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Proceeds from issuance of senior convertible debt | 155,500,000 |  |  | $ 155,500,000 |
Private Placement | Convertible Debt | 2023 Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Proceeds from issuance of senior convertible debt | 69,500,000 |  |  |  |
Proceeds from issuance of senior convertible debt, after issuance costs | $ 67,300,000 |  |  |  |

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