Income Taxes Foreign and U.S. Federal and State Tax Carryforwards for Income Tax Purposes (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 31, 2013
Operating Loss and Tax Credit Carry Forward [Line Items]
Foreign net operating loss carryforwards	33,618
Minimum [Member]
Operating Loss and Tax Credit Carry Forward [Line Items]
Operating Loss Carryforwards, Expiration Dates	Generally indefinite
Minimum [Member]
Operating Loss and Tax Credit Carry Forward [Line Items]
Other Tax Carryforward, Expiration Dates	Various
Minimum [Member]
Operating Loss and Tax Credit Carry Forward [Line Items]
Tax Credit Carryforward, Expiration Date	Jan. 31, 2014
Maximum [Member]
Operating Loss and Tax Credit Carry Forward [Line Items]
Tax Credit Carryforward, Expiration Date	Jan. 31, 2028
Minimum [Member]
Operating Loss and Tax Credit Carry Forward [Line Items]
Operating Loss Carryforwards, Expiration Dates	1/31/2014
Maximum [Member]
Operating Loss and Tax Credit Carry Forward [Line Items]
Operating Loss Carryforwards, Expiration Dates	1/31/2032
Minimum [Member]
Operating Loss and Tax Credit Carry Forward [Line Items]
Other Tax Carryforward, Expiration Dates	1/31/2023
Maximum [Member]
Operating Loss and Tax Credit Carry Forward [Line Items]
Other Tax Carryforward, Expiration Dates	1/31/2033
Maximum [Member]
Operating Loss and Tax Credit Carry Forward [Line Items]
Other Tax Carryforward, Expiration Dates	No expiration
Minimum [Member]
Operating Loss and Tax Credit Carry Forward [Line Items]
Tax Credit Carryforward, Expiration Date	Jan. 31, 2015
Maximum [Member]
Operating Loss and Tax Credit Carry Forward [Line Items]
Tax Credit Carryforward, Expiration Date	Jan. 31, 2023
Minimum [Member]
Operating Loss and Tax Credit Carry Forward [Line Items]
Operating Loss Carryforwards, Expiration Dates	1/31/2019
Maximum [Member]
Operating Loss and Tax Credit Carry Forward [Line Items]
Operating Loss Carryforwards, Expiration Dates	1/31/2032
Minimum [Member]
Operating Loss and Tax Credit Carry Forward [Line Items]
Tax Credit Carryforward, Expiration Date	Jan. 31, 2019
Maximum [Member]
Operating Loss and Tax Credit Carry Forward [Line Items]
Tax Credit Carryforward, Expiration Date	Jan. 31, 2033
Internal Revenue Service (IRS) [Member]
Operating Loss and Tax Credit Carry Forward [Line Items]
Research & experimentation carryforward	60,769
Net operating loss carryforward	206,368
Foreign tax credits	12,801
Alternative Minimum Tax credits	2,683
Other carryforwards	1,513
State and Local Jurisdiction [Member]
Operating Loss and Tax Credit Carry Forward [Line Items]
Research & experimentation carryforward	13,503
Net operating loss carryforward	186,129
Other carryforwards	1,293