XML 67 R51.htm IDEA: XBRL DOCUMENT v3.4.0.3
Income Tax (narrative) (detail) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Income Tax Disclosure [Abstract]      
Effective income tax rate 32.30% 29.90% 20.50%
Effective Income Tax Rate Continuing Operations Change 2.40%    
Unrecognized Tax Benefits, Period Increase (Decrease) $ 100 $ 100  
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued 100 100  
Tax Credit Carryforward [Line Items]      
Valuation allowance - non-current 1,861 1,787  
Deferred Income Tax Asset, Net 0 6,997  
Deferred Tax Assets, Net, Noncurrent 12,897 14,829  
Deferred Income Taxes, Net   $ 0  
New York [Member]      
Tax Credit Carryforward [Line Items]      
Tax Credit Carryforward, Valuation Allowance $ 0    
Expiration Date Dec. 31, 2031    
California [Member]      
Tax Credit Carryforward [Line Items]      
Tax Credit Carryforward, Valuation Allowance $ 1,200    
Expiration Date Dec. 31, 2026    
Wisconsin [Member]      
Tax Credit Carryforward [Line Items]      
Tax Credit Carryforward, Valuation Allowance $ 1,700    
Expiration Date Dec. 31, 2031