CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Loss
Balance at the beginning of the period (in shares) at Jun. 30, 2018		226.7
Balance at the beginning of the period at Jun. 30, 2018	$ 734.9	$ 0.2	$ 70,216.2	$ (69,378.6)	$ (102.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(7.1)			(7.1)
Other comprehensive income (loss)	(12.3)				(12.3)
Shares issued under employee stock plans, net of tax (in shares)		2.9
Shares issued under employee stock plans, net of tax	(7.1)		(7.1)
Stock-based compensation	28.7		28.7
Repurchase of common stock (in shares)		(0.9)
Repurchase of common stock	(9.0)			(9.0)
Other	0.2		0.2
Balance at the end of the period (in shares) at Mar. 30, 2019		228.7
Balance at the end of the period at Mar. 30, 2019	728.3	$ 0.2	70,238.0	(69,394.7)	(115.2)
Balance at the beginning of the period (in shares) at Dec. 29, 2018		228.0
Balance at the beginning of the period at Dec. 29, 2018	710.1	$ 0.2	70,226.8	(69,389.5)	(127.4)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(4.8)			(4.8)
Other comprehensive income (loss)	12.2				12.2
Shares issued under employee stock plans, net of tax (in shares)		0.7
Shares issued under employee stock plans, net of tax	0.4		0.4
Stock-based compensation	10.8		10.8
Repurchase of common stock (in shares)		0.0
Repurchase of common stock	(0.4)			(0.4)
Balance at the end of the period (in shares) at Mar. 30, 2019		228.7
Balance at the end of the period at Mar. 30, 2019	728.3	$ 0.2	70,238.0	(69,394.7)	(115.2)
Balance at the beginning of the period (in shares) at Jun. 29, 2019		228.8
Balance at the beginning of the period at Jun. 29, 2019	725.8	$ 0.2	70,244.7	(69,384.5)	(134.6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	2.0			2.0
Other comprehensive income (loss)	(31.0)				(31.0)
Shares issued under employee stock plans, net of tax (in shares)		2.8
Shares issued under employee stock plans, net of tax	(12.7)		(12.7)
Stock-based compensation	$ 33.5		33.5
Repurchase of common stock (in shares)	(3.6)	(3.6)
Repurchase of common stock	$ (43.8)			(43.8)
Other	0.1			0.1
Balance at the end of the period (in shares) at Mar. 28, 2020		228.0
Balance at the end of the period at Mar. 28, 2020	676.9	$ 0.2	70,265.5	(69,423.2)	(165.6)
Balance at the beginning of the period (in shares) at Dec. 28, 2019		230.2
Balance at the beginning of the period at Dec. 28, 2019	764.3	$ 0.2	70,254.0	(69,357.4)	(132.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(32.8)			(32.8)
Other comprehensive income (loss)	(33.1)				(33.1)
Shares issued under employee stock plans, net of tax (in shares)		0.6
Shares issued under employee stock plans, net of tax	(0.1)		(0.1)
Stock-based compensation	$ 11.6		11.6
Repurchase of common stock (in shares)	(2.8)	(2.8)
Repurchase of common stock	$ (33.1)			(33.1)
Other	0.1			0.1
Balance at the end of the period (in shares) at Mar. 28, 2020		228.0
Balance at the end of the period at Mar. 28, 2020	$ 676.9	$ 0.2	$ 70,265.5	$ (69,423.2)	$ (165.6)