Special (Income) Charges (Notes)	6 Months Ended
Sep. 30, 2013
Notes to Financial Statements [Abstract]
Special charges	Special (Income) Charges During the three months ended September 30, 2013, the Company incurred special charges of $0.8 million for an additional liability related to the acquisition of Roving Networks and $0.4 million of severance-related, office closing, and other costs associated with the acquisition of SMSC which were offset by $1.1 million of special income related to the release of an accrued bonus for a milestone that was not met for a business that SMSC had acquired prior to the Company's acquisition of SMSC. During the six months ended September 30, 2013, the Company incurred special charges of $1.4 million due to the increase in the fair value of contingent consideration related to one of its acquisitions, $0.8 million for an additional liability related to the acquisition of Roving Networks and $0.7 million of severance-related, office closing, and other costs associated with the acquisition of SMSC which were offset by $1.1 million of special income related to the release of an accrued bonus for a milestone that was not met for a business that SMSC had acquired prior to the Company's acquisition of SMSC. During the three and six months ended September 30, 2012, the Company incurred approximately $10.9 million of severance related, office closing, and other costs associated with the acquisition of SMSC. Also, during the three and six months ended September 30, 2012, the Company incurred legal settlement costs of approximately $11.5 million for certain legal matters related to Silicon Storage Technology, Inc. (which the Company acquired in April 2010) in excess of previously accrued amounts.

Special (Income) Charges

During the three months ended September 30, 2013, the Company incurred special charges of $0.8 million for an additional liability related to the acquisition of Roving Networks and $0.4 million of severance-related, office closing, and other costs associated with the acquisition of SMSC which were offset by $1.1 million of special income related to the release of an accrued bonus for a milestone that was not met for a business that SMSC had acquired prior to the Company's acquisition of SMSC. During the six months ended September 30, 2013, the Company incurred special charges of $1.4 million due to the increase in the fair value of contingent consideration related to one of its acquisitions, $0.8 million for an additional liability related to the acquisition of Roving Networks and $0.7 million of severance-related, office closing, and other costs associated with the acquisition of SMSC which were offset by $1.1 million of special income related to the release of an accrued bonus for a milestone that was not met for a business that SMSC had acquired prior to the Company's acquisition of SMSC.

During the three and six months ended September 30, 2012, the Company incurred approximately $10.9 million of severance related, office closing, and other costs associated with the acquisition of SMSC. Also, during the three and six months ended September 30, 2012, the Company incurred legal settlement costs of approximately $11.5 million for certain legal matters related to Silicon Storage Technology, Inc. (which the Company acquired in April 2010) in excess of previously accrued amounts.