Summary of Significant Accounting Policies - Net Income Per Common Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Numerator:
Income from continuing operations	$ 9,768	$ 10,988	$ 18,290	$ 20,167
Discontinued operations, net of tax	0	19	0	131
Net income	$ 9,768	$ 11,007	$ 18,290	$ 20,298
Denominator:
Weighted average shares outstanding for basic income per common share	9,331	9,296	9,321	9,420
Effect of dilutive stock options	89	45	82	47
Adjusted weighted average share outstanding for diluted income per common share	9,420	9,341	9,403	9,467
Basic:
Continuing operations (in dollars per share)	$ 1.05	$ 1.18	$ 1.96	$ 2.14
Discontinued operations (in dollars per share)	$ 0.00	$ 0.00	$ 0.00	$ 0.01
Total (in dollars per share)	$ 1.05	$ 1.18	$ 1.96	$ 2.15
Diluted:
Continuing operations (in dollars per share)	$ 1.04	$ 1.18	$ 1.95	$ 2.13
Discontinued operations (in dollars per share)	$ 0.00	$ 0.00	$ 0.00	$ 0.01
Total (in dollars per share)	$ 1.04	$ 1.18	$ 1.95	$ 2.14