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Investment Management Transfer Agent and Other Fees - Additional Information (Detail) (USD $) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2013 Funds | Jun. 30, 2013 Funds | Jun. 30, 2012 | Jun. 30, 2011
Investment Management Transfer Agent And Other Fees [Abstract] |  |  |  |
Number of equity funds with base advisory fee adjustment | 9 |  |  |
Base advisory fee adjustment, description | Is adjusted upwards or downwards by 0.25 percent if there is a performance difference of 5 percent or more between a fund's performance and that of its designated benchmark index over the prior rolling 12 months |  |  |
Increase (decrease) in base advisory fees realized |  | $ 133,011 | $ 2,230,811 | $ 2,380,608
Aggregate fees waived and expenses borne |  | 3,328,326 | 3,132,831 | 3,131,906
Number of funds, company agreed to cap the expenses |  | 13 |  |
Fees waived and or expenses reimbursed U.S. Treasury Securities Cash Fund to maintain minimum yield |  | 719,660 |  |
Fees waived and or expenses reimbursed for U.S. Government Securities Savings Fund to maintain minimum yield |  | 484,206 |  |
Minimum yield waivers recoverable through 12/31/13 |  | 1,562,956 |  |
Minimum yield waivers recoverable through 12/31/14 |  | 1,604,076 |  |
Minimum yield waivers recoverable through 12/31/15 |  | 1,245,458 |  |
Minimum yield waivers recoverable through 12/31/16 |  | $ 616,631 |  |

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