Investment Management Transfer Agent and Other Fees - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Mar. 31, 2013 Funds	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
Investment Management And Other Fees And Related Party Transactions [Line Items]
Number of equity funds with base advisory fee adjustment	9
Base advisory fee adjustment, description	Is adjusted upwards or downwards by 0.25 percent when 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	$ 108,969	$ 1,137,345	$ 56,095	$ 1,787,199
Aggregate fees waived and expenses borne	798,138	773,394	2,502,737	2,372,547
Number of funds, company agreed to cap the expenses	13
Number of domestic global investors funds offering institutional class shares	3
Fees waived and or expenses reimbursed U.S. treasury securities cash fund and U.S. government securities savings fund to maintain minimum yield	298,128	349,661	885,273	1,150,573
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			298,128
Recorded advisory and performance fees	$ 83,960	$ 86,536	$ 253,534	$ 263,634