Fair Value Measurements - Schedule of financial assets measured at fair value on a recurring basis (Detail) - Estimate of Fair Value Measurement [Member] - USD ($) $ in Millions		Mar. 25, 2023		Jun. 25, 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total assets at fair value		$ 481.7	[1]	$ 64.1	[2]
Municipal bonds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term investments		4.0	[1]	7.8	[2]
Corporate debt securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term investments		31.0	[1]	41.8	[2]
Money Market Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents		395.2	[1]	12.1	[2]
Certificates of deposit [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	[1]	50.6
Short-term investments		0.9	[1]	2.4	[2]
Level 1 Member
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total assets at fair value		395.2		12.1
Level 1 Member | Municipal bonds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term investments		0.0		0.0
Level 1 Member | Corporate debt securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term investments		0.0		0.0
Level 1 Member | Money Market Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents		395.2		12.1
Level 1 Member | Certificates of deposit [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents		0.0
Short-term investments		0.0		0.0
Level 2 Member
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total assets at fair value		86.5		52.0
Level 2 Member | Municipal bonds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term investments		4.0		7.8
Level 2 Member | Corporate debt securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term investments		31.0		41.8
Level 2 Member | Money Market Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents		0.0		0.0
Level 2 Member | Certificates of deposit [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents		50.6
Short-term investments		0.9		2.4
Level 3 Member
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total assets at fair value		0.0		0.0
Level 3 Member | Municipal bonds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term investments		0.0		0.0
Level 3 Member | Corporate debt securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term investments		0.0		0.0
Level 3 Member | Money Market Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents		0.0		0.0
Level 3 Member | Certificates of deposit [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents		0.0
Short-term investments		$ 0.0		$ 0.0

[1] Excludes $452.2 million in cash held in our bank accounts as of March 2023

[2] Excludes $811.9 million in cash held in our bank accounts as of June 2022.