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Special Charges Changes in Accrued Special Charges (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
Restructuring Cost and Reserve
Special charges	$ 23,490ment_SpecialCharges	$ 16,929ment_SpecialCharges	$ 9,946ment_SpecialCharges
Special charges payments	(26,819)ment_AccruedSpecialChargesSettled	(14,624)ment_AccruedSpecialChargesSettled	(10,884)ment_AccruedSpecialChargesSettled
Accrued special charges	4,517ment_AccruedSpecialCharges	7,846ment_AccruedSpecialCharges	5,541ment_AccruedSpecialCharges	6,479ment_AccruedSpecialCharges
Litigation Costs
Restructuring Cost and Reserve
Special charges	18,408	11,597	3,632
Special charges payments	(19,857)	(7,366)	(3,008)
Accrued special charges	3,406	4,855	624	0
Employee Severance
Restructuring Cost and Reserve
Special charges	3,535	4,392	4,016
Special charges payments	(4,169)	(5,416)	(5,656)
Accrued special charges	370	1,004	2,028	3,668
Other Restructuring
Restructuring Cost and Reserve
Special charges	1,547	940	2,298
Special charges payments	(2,793)	(1,842)	(2,220)
Accrued special charges	$ 741	$ 1,987	$ 2,889	$ 2,811