Common Stock and Stock Plans - Additional Information (Detail) - USD ($)	12 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost charged against income	$ 81,070,000	$ 80,385,000	$ 83,631,000
Compensation costs capitalized	$ 9,600,000	$ 8,100,000	$ 10,700,000
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average period over which unrecognized compensation cost is expected to be recognized	1 year 6 months
Award contractual term	6 years
Number of Shares, Granted	18,000
Weighted average estimated fair value of stock options granted	$ 5.79	$ 9.87	$ 15.73
Stock options exercised intrinsic value		$ 0
Employee Stock Option | Minimum [Member] | Board of Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	1 year			1 year
Employee Stock Option | Maximum [Member] | Board of Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
PSO [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average period over which unrecognized compensation cost is expected to be recognized	2 years 1 month 6 days
Market-based Performance Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Plan description	The Company grants total shareholder return (TSR) performance stock options to executive officers under the Equity Participation Plan. The number of shares of TSR PSOs that will become vested and exercisable will range from 0% to 175% of the target number of options based on the time-based vesting schedule described below and is based on a comparison over the performance period of the Company’s TSR to the TSR of the companies included in an index. The Company’s TSR PSOs have a four-year time-based vesting schedule and a six-year contractual term. The TSR PSOs must be vested under both the time-based vesting schedule and the performance-based vesting conditions in order to become exercisable. In fiscal year 2024, the Company granted price hurdle PSOs to executive officers and certain other high-level employees under the Equity Participation Plan. The price hurdle PSOs must be vested under both a three-year time-based vesting schedule and a market-based vesting condition in order to become exercisable and have a six-year contractual term. The number of options that may become vested and exercisable will range from 0% to 250% of the target number of options granted depending on whether the forty-five calendar day trailing average market closing price of the Company's common stock ending on and including such date equals or exceeds certain levels. The Company estimates the fair value of the TSR PSOs and the price hurdle PSOs (collectively, the PSOs) at the grant date using a Monte Carlo simulation.
Number of Shares, Granted	0	0
Weighted average estimated fair value of stock options granted			$ 16.01
Stock options exercised intrinsic value	$ 3,700,000
Market-Based Performance Stock Options and TSR [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	4 years
Award contractual term	6 years
Market-Based Performance Stock Options and Price Hurdle [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Award contractual term	6 years
RSU [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost charged against income	$ 67,000,000	$ 56,600,000	$ 57,400,000
Weighted average period over which unrecognized compensation cost is expected to be recognized	6 months
Weighted average estimated fair value of restricted stock units granted	$ 27.49	$ 15.77	$ 29.21
Total fair value of shares vested related to restricted stock units	$ 47,300,000	$ 15,300,000	$ 34,100,000
RSU [Member] | Board of Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	1 year
RSU [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
RSU [Member] | Minimum [Member] | Board of Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				1 year
RSU [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	4 years
PSU [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost charged against income	$ 3,900,000	$ 5,100,000
Weighted average period over which unrecognized compensation cost is expected to be recognized	1 year 9 months 18 days
Weighted average estimated fair value of restricted stock units granted	$ 33.04	$ 18.13
PSU [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares that may be issued, as a percentage	0.00%
Award vesting period	1 year
PSU [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares that may be issued, as a percentage	200.00%
Award vesting period	3 years
Equity Participation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for issuance	6,410,000
Plan description	The Company believes that such awards align the interests of its executive officers, employees, consultants and non-employee directors with those of its stockholders. Shares of the Company’s common stock granted under the Equity Participation Plan in the form of stock options or stock appreciation right or as a stock appreciation right with a per share purchase price lower than 100% of fair market value on the date of grant are counted against the Equity Participation Plan share reserve on a one-for-one basis, and PSOs and PSUs are calculated assuming “maximum” performance.
Equity Participation Plan [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Discount on the fair market value of common stock purchased under the Employee Stock Purchase Plan	100.00%
2024 Employment Inducement Incentive Award Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares reserved for issuance	377,500
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares reserved for issuance	16,950,000
Discount on the fair market value of common stock purchased under the Employee Stock Purchase Plan	85.00%
Compensation cost charged against income	$ 7,500,000	$ 7,500,000	$ 8,000,000
Unrecognized compensation cost related to unvested stock-based compensation arrangements	$ 2,500,000
Weighted average period over which unrecognized compensation cost is expected to be recognized	6 months
Weighted average estimated fair value of employee stock purchase plan shares issued	$ 9.31	$ 5.22	$ 8.79
Equity Participation Plan and Inducement Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost charged against income	$ 73,500,000	$ 72,900,000	$ 75,600,000
Unrecognized compensation cost related to unvested stock-based compensation arrangements	$ 159,200,000