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Management Contracts Purchased - Additional Information (Detail)	Mar. 31, 2016 USD ($) Funds
Contractors [Abstract]
Number of mutual funds | Funds	23
Management contracts impairment amount | $	$ 0

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- Definition

Management contracts impairment amount.

+ References

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- Definition

Number of mutual funds.

+ References

No definition available.

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Balance Type:	na
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- References

No definition available.

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Namespace Prefix:	us-gaap_
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