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Fair Value Measurements Text Tag (Details)
$ in Thousands
 12 Months Ended
Mar. 31, 2015
USD ($)
Mar. 31, 2016
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities $ (100,204) [1],[2] $ (56,180)
Percent of Total Assets Level 3 0.00% 0.00%
Transfers between level 1 and level 2 0  
Restatement Adjustment [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities $ 981  
[1] (1) March 31, 2015 and 2014 balances have been restated from previously reported results to correct for material and certain other errors from prior periods. Refer to Notes 1 and 18 for further detail.
[2] (1) March 31, 2015 balances have been restated from previously reported results to correct for material and certain other errors from prior periods. Refer to Notes 1 and 18 for further detail.