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Subsequent Events (Details) (Threatened litigation, Subsequent event, USD $) In Millions, unless otherwise specified	Jul. 31, 2012
Threatened litigation \| Subsequent event
Subsequent Event
Estimate of potential exposure, minimum	$ 0
Estimate of potential exposure, maximum	$ 1.9

The estimated maximum amount of possible loss from the contingency.

The estimated minimum amount of possible loss from the contingency.