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Income Taxes (Reconciliation of Effective Tax Rate) (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Income Tax Disclosure [Abstract]      
Income tax provision at statutory rate $ 55,015 $ 44,610 $ 35,612
Income tax provision at statutory rate, percentage 35.00% 35.00% 35.00%
Foreign tax benefit $ (2,894) $ (2,019) $ (918)
Foreign tax benefit provision, percentage (1.80%) (1.60%) (0.90%)
State income taxes, net of federal income tax benefit $ 3,284 $ 2,865 $ 2,004
State income taxes, net of federal income tax benefit, percentage 2.00% 2.30% 2.00%
Decrease in net deferred tax liability resulting from a change in the effective state tax rate $ 0 $ 0 $ (8,892)
Decrease in net deferred tax liability resulting from a change in the effective state tax rate, percentage 0.00% 0.00% (8.70%)
Goodwill adjustment for sale of asset $ 0 $ 206 $ 0
Goodwill adjustment for sale of asset, percentage 0.00% 0.20% 0.00%
Nondeductible transaction costs $ 1,071 $ 2,936 $ 0
Transaction costs, percentage 0.70% 2.30% 0.00%
Nondeductible compensation $ 758 $ 566 $ 1,011
Nondeductible compensation, percentage 0.50% 0.40% 1.00%
Other $ 44 $ 34 $ 316
Other, percentage 0.00% 0.00% 0.30%
Total provision for income taxes $ 57,278 $ 49,198 $ 29,133
Total provision for income taxes, percentage 36.40% 38.60% 28.70%