Stock-Based Compensation and Stock Options - Stock Options (Detail) - $ / shares	3 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Options outstanding, beginning balance	1,115,465	1,163,179
Options granted, Shares	44,900	39,700
Options exercised, Shares	(76,623)	(35,837)
Options cancelled/forfeited, Shares	(9,221)	0
Options outstanding, ending balance	1,074,521	1,167,042
Options outstanding, beginning Average Price	$ 30.36	$ 27.65
Options granted, Average Price	45.74	34.67
Options exercised, Average Price	22.11	19.16
Options cancelled/forfeited, Average Price	35.43	0.00
Option outstanding, Weighted Average Exercise Price per Share, ending balance	$ 31.56	$ 28.15