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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
Sep. 30, 2023
Jun. 24, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total assets at fair value $ 500.8 [1] $ 80.4 [2]
Municipal bonds [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments 1.0 [1] 3.1 [2]
Corporate debt securities [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments 5.5 [1] 6.3 [2]
Money Market Funds [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents 426.7 [1] 54.4 [2]
Treasury bills [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents [2]   16.4
Short-term investments [1] 16.6  
Certificates of deposit [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents [1] 51.0  
Short-term investments [2]   0.2
Level 1 Member    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total assets at fair value 443.3 70.8
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 426.7 54.4
Level 1 Member | Treasury bills [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents   16.4
Short-term investments 16.6  
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
Level 2 Member    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total assets at fair value 57.5 9.6
Level 2 Member | Municipal bonds [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments 1.0 3.1
Level 2 Member | Corporate debt securities [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments 5.5 6.3
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 | Treasury bills [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents   0.0
Short-term investments 0.0  
Level 2 Member | Certificates of deposit [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents $ 51.0  
Short-term investments   $ 0.2
[1] Excludes $323.6 million in cash held in our bank accounts as of September 2023. We did not have any financial instruments measured at fair value on a recurring basis within Level 3 fair value in this period.
[2] Excludes $853.9 million in cash held in our bank accounts as of June 2023. We did not have any financial instruments measured at fair value on a recurring basis within Level 3 fair value.