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Creation And Redemption Of Creation Units - Additional Information (Detail) (USD $)
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5 Months Ended | 9 Months Ended |
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Jun. 03, 2014
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Sep. 30, 2014
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| Creation Unit, block Shares of a fund | 50,000 | 50,000 |
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Maximum [Member]
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| Variable transaction fee, percent of the value of the Creation Unit, maximum | 0.10% | 0.10% |
| Fixed transaction fee | $ 500 | $ 500 |