Common Stock and Stock Plans - Additional Information (Detail) - USD ($)	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Apr. 03, 2015	Nov. 30, 1996
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost charged against income	$ 55,775,000	$ 47,510,000	$ 39,353,000
Compensation costs capitalized	6,600,000	5,600,000	2,500,000
Employee Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incremental tax benefit from stock options exercised and restricted stock unit awards vesting	$ 0	$ 0	$ 0
Weighted average period over which unrecognized compensation cost is expected to be recognized	2 years 8 months 12 days
Employee stock option vesting period	4 years
Employee stock option contractual term	6 years
Weighted average estimated fair value of employee stock options granted	$ 23.62	$ 20.35	$ 22.22
Stock options exercised intrinsic value	$ 8,300,000	$ 14,500,000	$ 28,900,000
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incremental tax benefit from stock options exercised and restricted stock unit awards vesting	0	0	0
Compensation cost charged against income	$ 44,900,000	$ 38,400,000	$ 31,400,000
Weighted average period over which unrecognized compensation cost is expected to be recognized	2 years 9 months 18 days
Employee stock option vesting period	4 years
Weighted average estimated fair value of restricted stock units granted	$ 69.99	$ 61.81	$ 65.20
Total fair value of shares vested related to restricted stock units	$ 58,400,000	$ 43,800,000	$ 30,600,000
Equity Participation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares reserved for issuance	25,200,000
Plan share reserve	Shares of the Company’s common stock granted under the Equity Participation Plan in the form of stock options or stock appreciation right are counted against the Equity Participation Plan share reserve on a one for one basis. Shares of the Company’s common stock granted under the Equity Participation Plan as an award other than as an option 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 as two shares for each share of common stock prior to September 22, 2010 and subsequent to September 19, 2012, and as 2.65 shares for each share of common stock during the period beginning on September 22, 2010 and ending on September 19, 2012.
Compensation cost charged against income	$ 52,600,000	45,200,000	37,200,000
Unrecognized compensation cost related to unvested stock-based compensation arrangements	$ 158,900,000
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares reserved for issuance	2,850,000			2,550,000
Discount on the fair market value of common stock purchased under the Employee Stock Purchase Plan	85.00%
Compensation cost charged against income	$ 3,100,000	$ 2,300,000	$ 2,100,000
Unrecognized compensation cost related to unvested stock-based compensation arrangements	$ 900,000
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	$ 16.27	$ 13.37	$ 14.18