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Other Operating Losses	3 Months Ended
Other Operating Losses	Oct. 31, 2012
Other Operating Losses [Abstract]
Other Operating Losses	Note 3—Other Operating Losses In the three months ended October 31, 2012, the Company recorded a loss of $0.4 million related to a legal matter. On October 12, 2011, the Company entered into a binding term sheet with T-Mobile USA, Inc. (“T-Mobile”) to settle litigation related to an alleged breach of a wholesale supply agreement. In consideration of the settlement of all disputes between the parties, on October 13, 2011, the Company paid T-Mobile $10 million. The Company incurred legal fees of $1.0 million in connection with this matter. In addition, in the three months ended October 31, 2011, the Company recorded a $0.2 million loss on the settlement of an unrelated claim.