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Equity Plans and Stock-Based Compensation - Fair Value-Based Measurements and Weighted-Average Assumptions (Detail) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Employee Stock Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted-average fair value per share	$ 7.13	$ 7.39	$ 7.26	$ 7.97
Risk-free interest rate	3.80%	2.90%	4.00%	2.01%
Expected life (in years)	4 years 6 months	4 years 6 months	4 years 6 months	4 years 6 months
Volatility	0.80%	0.80%	0.80%	0.80%
Market Based Performance Stock Unit
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted-average fair value per share			$ 18.25	$ 11.62
Risk-free interest rate			4.30%	1.70%
Expected life (in years)			2 years 10 months 24 days	2 years 10 months 24 days
Volatility			0.90%	0.90%

X

- Definition

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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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.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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