Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)		3 Months Ended	6 Months Ended
	Oct. 01, 2018	Sep. 30, 2018	Sep. 30, 2018
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Number of shares of common stock repurchased		133,425	199,978
Treasury stock, value, acquired, cost method		$ 7,800,000	$ 11,300,000
Average price per share of common stock		$ 58.58	$ 56.52
Subsequent Event [Member]
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Number of shares of common stock repurchased	81,308
Treasury stock, value, acquired, cost method	$ 4,599,000
Average price per share of common stock	$ 56.56