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Fair Values of Assets and Liabilities Information Regarding Proprietary Fund Products (Details 2) - Proprietary Funds [Member]
$ in Thousands
Dec. 31, 2017
USD ($)
Mar. 31, 2017
USD ($)
Fair Value, Option, Quantitative Disclosures [Line Items]    
Investments, Fair Value Disclosure $ 271,238 $ 305,288
Number of Proprietary Fund Products with Seed Capital Investment in Excess of One Million Dollars 58 57
Minimum value of seed investment included in count of funds with corporate investment $ 1,000  
Percentage of Investments In Proprietary Fund Products In Excess of Threshold 90.00%