Net Income per Share (Details)	3 Months Ended				6 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Reconciliations of basic to diluted weighted-average common shares outstanding
Weighted-average shares used in basic computation	34,632,000		34,496,000		34,629,000		34,474,000
Dilutive effect of stock-based awards	322,000	[1]	298,000	[1]	312,000	[1]	322,000	[1]
Weighted-average shares used in diluted computation (in shares)	34,954,000		34,794,000		34,941,000		34,796,000
Excluded NSUs
Options excluded in the computation of diluted income per share
Options excluded in the computation of diluted income per share (in shares)	143,000	[1]	274,000	[1]	143,000	[1]	274,000	[1]
Excluded restricted stock units (RSUs)
Options excluded in the computation of diluted income per share
Options excluded in the computation of diluted income per share (in shares)	888,000	[1]	639,000	[1]	888,000	[1]	639,000	[1]
Excluded 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)	525,000	[1]	525,000	[1]	525,000	[1]	525,000	[1]

[1] The share-based awards that were excluded from the dilutive effect were excluded because necessary conditions had not been satisfied for the shares to be issuable based on the Company’s performance through the three and six months ended September 30, 2014 and 2013, respectively. The excluded awards include the maximum amounts achievable for these awards.