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Fair Values of Assets and Liabilities Information Regarding Proprietary Fund Products (Details 2) - Proprietary Funds [Member] $ in Thousands	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)
Fair Value, Option, Quantitative Disclosures [Line Items]
Investments, Fair Value Disclosure	$ 277,504	$ 305,288
Number of Proprietary Fund Products with Seed Capital Investment in Excess of One Million Dollars	55	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%

- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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