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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
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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.

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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