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	Mar. 30, 2019	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Jul. 01, 2017	Apr. 04, 2015	Jun. 30, 2018	Sep. 29, 2018	Dec. 29, 2018	May 17, 2017	May 11, 2017
Stockholders Equity Note [Line Items]
Treasury Stock, Shares, Acquired								1,399,732	2,086,792
Interest Expense						$ 1.3
Forward share purchase contract							$ 350.0
Payments for Repurchase of Common Stock		$ 8.1	$ 300.0	$ 200.0	$ 11.4
Common Stock, Shares, Issued		176,902,738								176,902,738
Long-term Debt		$ 750.0
Number of common shares purchased under call option					3,200,000	4,600,000
Call option, aggregate premium					$ 57.3
Preferred Stock, Value, Issued		$ 750.0								$ 750.0
Equity Units Conversion Rate Number Of Common Stock Shares		0.7264				0.7241
Document Period End Date		Mar. 30, 2019
equity units issued						7,500,000
Equity Unit						$ 750.0
Shares Issued, Price Per Share		$ 137.67				$ 100						$ 138.10
Forward Contract Indexed to Issuer's Equity, Forward Rate Per Share		100			$ 100	100
Preferred Stock, Liquidation Preference Per Share						$ 1,000
equity unit proceeds						$ 726.0
Preferred Stock, Shares Issued						750,000
Preferred Stock, Liquidation Preference, Value						$ 750.0
Preferred Stock Conversion Rate Number Of Common Stock Shares		6.1820				$ 6.1627
Option Indexed to Issuer's Equity, Strike Price		$ 161.76				$ 162.27
Forward Contract Indexed to Issuer's Equity, Shares						5,400,000	3,645,510
Option Indexed to Issuer's Equity, Settlement Alternatives, Cash, at Fair Value		$ 29.7
Percentage Of Contract Price Paid						5.375%
Forward Contract Indexed to Issuer's Equity, Settlement Alternatives, Cash, at Fair Value		$ 49.0									$ 117.1
Call Option [Member]
Stockholders Equity Note [Line Items]
Call option, average price (in dollars per share)					$ 17.96	$ 5.43
Maximum [Member]
Stockholders Equity Note [Line Items]
Option Indexed to Issuer's Equity, Strike Price	$ 203.92	$ 203.79				179.53
Minimum [Member]
Stockholders Equity Note [Line Items]
Option Indexed to Issuer's Equity, Strike Price	$ 156.86	$ 156.76				$ 162.27
May 2017 Capped Call [Member]
Stockholders Equity Note [Line Items]
Option Indexed to Issuer's Equity, Settlement Alternatives, Cash, at Fair Value		$ 15.0
May 2017 Capped Call [Member] | Maximum [Member]
Stockholders Equity Note [Line Items]
Option Indexed to Issuer's Equity, Strike Price		$ 178.97
May 2017 Capped Call [Member] | Minimum [Member]
Stockholders Equity Note [Line Items]
Option Indexed to Issuer's Equity, Strike Price		$ 161.76
Call Option [Member]
Stockholders Equity Note [Line Items]
Call option, aggregate premium						$ 25.1