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, 2014
Operating Loss and Tax Credit Carry Forward
Foreign net operating loss carryforwards	$ 34,122
Minimum
Operating Loss and Tax Credit Carry Forward
Expiration date of tax credit carryforwards	Jan. 31, 2015
Maximum
Operating Loss and Tax Credit Carry Forward
Expiration date of tax credit carryforwards	Jan. 31, 2029
Minimum
Operating Loss and Tax Credit Carry Forward
Expiration date of operating loss carryforwards	Jan. 31, 2015
Maximum
Operating Loss and Tax Credit Carry Forward
Expiration date of operating loss carryforwards	Jan. 31, 2033
Minimum
Operating Loss and Tax Credit Carry Forward
Expiration date of tax credit carryforwards	Jan. 31, 2023
Maximum
Operating Loss and Tax Credit Carry Forward
Expiration date of tax credit carryforwards	Jan. 31, 2034
Minimum
Operating Loss and Tax Credit Carry Forward
Expiration date of tax credit carryforwards	Jan. 31, 2015
Maximum
Operating Loss and Tax Credit Carry Forward
Expiration date of tax credit carryforwards	Jan. 31, 2024
Minimum
Operating Loss and Tax Credit Carry Forward
Expiration date of operating loss carryforwards	Jan. 31, 2019
Maximum
Operating Loss and Tax Credit Carry Forward
Expiration date of operating loss carryforwards	Jan. 31, 2032
Minimum
Operating Loss and Tax Credit Carry Forward
Expiration date of tax credit carryforwards	Jan. 31, 2019
Maximum
Operating Loss and Tax Credit Carry Forward
Expiration date of tax credit carryforwards	Jan. 31, 2034
Internal Revenue Service (IRS)
Operating Loss and Tax Credit Carry Forward
Research and experimentation credit carryforward	70,201
Net operating loss carryforward	179,123
Foreign tax credits	14,335
Alternative minimum tax credits	2,683
Miscellaneous	1,649
State and Local Jurisdiction
Operating Loss and Tax Credit Carry Forward
Research and experimentation credit carryforward	18,026
Net operating loss carryforward	213,490
Miscellaneous	$ 1,199