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Equity Arrangements - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2018 | Sep. 28, 2019 | Sep. 29, 2018 | Jun. 30, 2018 | Jul. 01, 2017 | Apr. 04, 2015 | Jun. 29, 2019 | Jun. 30, 2018 | Sep. 28, 2019 | Dec. 29, 2018 | May 17, 2017 | May 11, 2017
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired |  |  | 2,086,792 | 1,399,732 |  |  |  |  |  |  |  |
Treasury Stock, Common, Value |  |  | $ 300.0 | $ 200.0 |  |  |  | $ 200.0 |  |  |  |
Interest Expense |  |  |  |  | $ 1.3 |  |  |  |  |  |  |
Forward share purchase contract |  |  |  |  |  | $ 350.0 |  |  |  |  |  |
Common Stock, Shares, Issued |  |  |  |  |  |  | 176,902,738 |  |  | 176,902,738 |  |
Long-term Debt |  |  |  |  |  |  |  |  | $ 750.0 |  |  |
Number of common shares purchased under call option |  |  |  |  | 4,600,000 |  |  | 3,200,000 |  |  |  |
Preferred Stock, Value, Issued |  | $ 750.0 |  |  |  |  |  |  | $ 750.0 | $ 750.0 |  |
Document Period End Date |  |  |  |  |  |  |  |  | Sep. 28, 2019 |  |  |
equity units issued |  |  |  |  | 7,500,000 |  |  |  |  |  |  |
Equity Unit |  |  |  |  | $ 750.0 |  |  |  |  |  |  |
Shares Issued, Price Per Share |  | $ 137.47 |  |  | $ 100 |  |  |  | $ 137.47 |  |  | $ 138.10
Forward Contract Indexed to Issuer's Equity, Forward Rate Per Share |  |  |  | $ 100 | 100 |  |  |  | 100 |  |  |
Preferred Stock, Liquidation Preference Per Share |  |  |  |  | 1,000 |  |  |  |  |  |  |
Preferred Stock Conversion Rate Number Of Common Stock Shares |  |  |  |  | $ 6.1627 |  |  |  | 6.1911 |  |  |
equity unit proceeds |  |  |  |  | $ 726.0 |  |  |  |  |  |  |
Preferred Stock, Shares Issued |  |  |  |  | 750,000 |  |  |  |  |  |  |
Preferred Stock, Liquidation Preference, Value |  |  |  |  | $ 750.0 |  |  |  |  |  |  |
Option Indexed to Issuer's Equity, Strike Price |  | $ 161.52 |  |  | $ 162.27 |  |  |  | $ 161.52 |  |  |
Forward Contract Indexed to Issuer's Equity, Shares |  |  |  |  | 5,500,000 | 3,645,510 |  |  |  |  |  |
Forward Contract Indexed to Issuer's Equity, Indexed Shares |  | 0.7274 |  |  | 0.7241 |  |  |  | 0.7274 |  |  |
Option Indexed to Issuer's Equity, Settlement Alternatives, Cash, at Fair Value |  |  |  |  |  |  | $ 32.3 |  |  |  |  |
Percentage Of Contract Price Paid |  |  |  |  | 5.375% |  |  |  |  |  |  |
Forward Contract Indexed to Issuer's Equity, Settlement Alternatives, Cash, at Fair Value |  | $ 29.5 |  |  |  |  |  |  | $ 29.5 |  | $ 117.1 |
Call Option [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Adjustments to Additional Paid in Capital, Other |  |  |  |  | $ 25.1 |  |  | $ 57.3 |  |  |  |
Call option, average price (in dollars per share) |  |  |  |  | $ 5.43 |  |  | $ 17.96 |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Option Indexed to Issuer's Equity, Strike Price | $ 203.92 |  |  |  | 179.53 |  | $ 203.65 |  |  |  |  |
Maximum [Member] | May 2017 Capped Call [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Option Indexed to Issuer's Equity, Strike Price |  |  |  |  |  |  |  |  | $ 178.71 |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Option Indexed to Issuer's Equity, Strike Price | $ 156.86 |  |  |  | $ 162.27 |  | $ 156.65 |  |  |  |  |
Minimum [Member] | May 2017 Capped Call [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Option Indexed to Issuer's Equity, Strike Price |  |  |  |  |  |  |  |  | $ 161.52 |  |  |
May 2017 Capped Call [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Option Indexed to Issuer's Equity, Settlement Alternatives, Cash, at Fair Value |  | $ 16.9 |  |  |  |  |  |  | $ 16.9 |  |  |

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