Selected Quarterly Financial Information (unaudited) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Jun. 27, 2020	Mar. 28, 2020	Dec. 28, 2019	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Dec. 29, 2018	Sep. 29, 2018	Jun. 27, 2020	Jun. 29, 2019	Jun. 30, 2018
Quarterly consolidated statements of operations
Net revenue	$ 266.6	$ 256.2	$ 313.7	$ 299.8	$ 289.7	$ 265.2	$ 306.9	$ 268.5	$ 1,136.3	$ 1,130.3	$ 875.7
Gross profit	154.6	146.8	189.5	174.4	169.5	153.5	178.0	150.4	665.3	651.4	488.4
Net income (loss) from continuing operations, net of tax	26.7	(32.8)	28.0	6.8	12.5	(4.8)	15.4	(15.3)	28.7	7.8	(48.6)
Net income (loss) from discontinued operations, net of tax	0.0	0.0	0.0	0.0	0.0	0.0	(2.4)	0.0	0.0	(2.4)	0.0
Net income (loss)	$ 26.7	$ (32.8)	$ 28.0	$ 6.8	$ 12.5	$ (4.8)	$ 13.0	$ (15.3)	$ 28.7	$ 5.4	$ (48.6)
Net income (loss) per share from - basic:
Continuing operations (usd per share)	$ 0.12	$ (0.14)	$ 0.12	$ 0.03	$ 0.05	$ (0.02)	$ 0.07	$ (0.07)	$ 0.13	$ 0.03	$ (0.21)
Discontinued operations (usd per share)	0	0	0	0	0	0	(0.01)	0	0	(0.01)	0
Net income (loss) (usd per share)	0.12	(0.14)	0.12	0.03	0.05	(0.02)	0.06	(0.07)	0.13	0.02	(0.21)
Net income (loss) per share from - diluted:
Continuing operations (usd per share)	0.12	(0.14)	0.12	0.03	0.05	(0.02)	0.07	(0.07)	0.12	0.03	(0.21)
Discontinued operations (usd per share)	0	0	0	0	0	0	(0.01)	0	0	(0.01)	0
Net income (loss) (usd per share)	$ 0.12	$ (0.14)	$ 0.12	$ 0.03	$ 0.05	$ (0.02)	$ 0.06	$ (0.07)	$ 0.12	$ 0.02	$ (0.21)
Shares used in per share calculation:
Basic (in shares)	228.1	230.0	230.0	229.4	228.7	228.3	228.3	227.2	229.4	228.1	227.1
Diluted (in shares)	230.3	230.0	238.3	236.4	232.5	228.3	230.4	227.2	233.7	231.2	227.1