Consolidated Statements of Shareholders' Equity - USD ($) $ in Millions		Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Income [Member]	Retained Earnings [Member]
Balance Beginning at Jul. 01, 2017		$ 925.5	$ 1.0	$ 855.5	$ 2.4	$ 66.6
Balance Beginning, shares at Jul. 01, 2017			100.8
Issuance of common stock under stock-based compensation plans		(2.1)		(2.1)
Issuance of common stock under stock-based compensation plans, shares			0.2
Net income		22.6				22.6
Stock-based compensation expense		3.4		3.4
Balance Ending at Sep. 30, 2017		949.4	$ 1.0	856.8	2.4	89.2
Balance Ending, shares at Sep. 30, 2017			101.0
Balance Beginning at Jun. 30, 2018		$ 1,135.3	$ 1.0	861.2	8.3	264.8
Balance Beginning, shares at Jun. 30, 2018		103,200,000	103.2
Issuance of common stock under stock-based compensation plans		$ (2.3)		(2.3)
Issuance of common stock under stock-based compensation plans, shares			0.4
Net income		28.2				28.2
Interest rate swaps		0.3			0.3
Stock-based compensation expense		3.8		3.8
Change in accounting principle	[1]				0.9	(0.9)
Balance Ending at Sep. 29, 2018		$ 1,165.3	$ 1.0	$ 862.7	$ 9.5	$ 292.1
Balance Ending, shares at Sep. 29, 2018		103,600,000	103.6

[1] As of the beginning of fiscal 2019, the Company elected to early adopt the provisions of ASU 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities. Refer to Note 3 for further discussion.