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Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	Jan. 31, 2013
Commitment And Contingencies [Line Items]
Net of liability recovered, minimum	$ 1.1
Net of liability recovered, maximum	2.7
Accrued liability	$ 1.7

The estimated maximum amount of possible loss from the contingency.

The estimated minimum amount of possible loss from the contingency.