Net Income per Share (Additional Information) (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Reconciliations of basic to diluted weighted-average common shares outstanding
Weighted-average shares used in basic computation (in shares)	31,973	32,341	32,018	32,655
Dilutive effect of stock-based awards (in shares)	336	502	359	502
Weighted-average shares used in diluted computation (in shares)	32,309	32,843	32,377	33,157
Annual RSUs
Options excluded in the computation of diluted income per share
Options excluded in the computation of diluted income per share (in shares)	95	175	97	175
Long-term incentive plan RSUs
Options excluded in the computation of diluted income per share
Options excluded in the computation of diluted income per share (in shares)	384	521	384	521
Employee stock option
Options excluded in the computation of diluted income per share
Options excluded in the computation of diluted income per share (in shares)	208	0	208	0
Stock appreciation rights (SARs)
Options excluded in the computation of diluted income per share
Options excluded in the computation of diluted income per share (in shares)	0	90	0	90