Subsequent Events (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2014 FireEye Inc. Fair value accounting	Nov. 06, 2014 FireEye Inc. Fair value accounting Subsequent event
Subsequent Event [Line Items]
Shares owned (Fund Shares)		4.9
Closing stock price	$ 112.09	$ 30.56	$ 30.04