Business And Summary Of Significant Accounting Policies (Narrative) (Details) (USD $)	3 Months Ended									12 Months Ended
	Jan. 31, 2015	Oct. 31, 2014	Jul. 31, 2014	Apr. 30, 2014	Jan. 31, 2014	Oct. 31, 2013	Apr. 30, 2013	Oct. 31, 2012	Jul. 31, 2012	Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2013
Business And Summary Of Significant Accounting Policies [Line Items]
Operating Expenses, Restatement and Remediation Related	$ 2,300,000	$ 2,100,000	$ 5,400,000	$ 12,200,000	$ 24,800,000		$ 3,000,000	$ 15,000,000	$ 11,000,000	$ 22,043,000	$ 53,791,000	$ 0
Product Warranty Period										2 years
Accounts Receivable Sold To and Held by Financial Institutions	310,900,000				263,700,000					310,900,000	263,700,000
Discount fees on sale of accounts receivable										4,400,000	3,400,000	2,600,000
Intangible assets, useful life, minimum, years										7 years	7 years
Value added tax payable	197,400,000				233,900,000					197,400,000	233,900,000
Value added tax receivable	37,800,000				100,000,000					37,800,000	100,000,000
Accumulated other comprehensive income, tax portion	23,000,000				23,000,000					23,000,000	23,000,000	23,000,000
Gain (Loss) Related to Litigation Settlement		(5,100,000)			(12,600,000)	(22,900,000)				(5,059,000)	(35,511,000)	0
Capitalized software and development costs
Business And Summary Of Significant Accounting Policies [Line Items]
Intangible assets, useful life, minimum, years										4 years	6 years	8 years
Personal Computer Related Software [Member]
Business And Summary Of Significant Accounting Policies [Line Items]
Intangible assets, useful life, minimum, years										3 years
Mainframe Software Licenses [Member]
Business And Summary Of Significant Accounting Policies [Line Items]
Intangible assets, useful life, minimum, years										5 years
Maximum
Business And Summary Of Significant Accounting Policies [Line Items]
Revenue from configured product, percentage of net sales										10.00%	10.00%	10.00%
Product warranty charges, percentage of net sales										10.00%
Maximum | Capitalized software and development costs
Business And Summary Of Significant Accounting Policies [Line Items]
Intangible assets, useful life, minimum, years										10 years
Maximum | Strategic Applications [Member]
Business And Summary Of Significant Accounting Policies [Line Items]
Intangible assets, useful life, minimum, years										10 years
Minimum | Capitalized software and development costs
Business And Summary Of Significant Accounting Policies [Line Items]
Intangible assets, useful life, minimum, years										3 years
Minimum | Strategic Applications [Member]
Business And Summary Of Significant Accounting Policies [Line Items]
Intangible assets, useful life, minimum, years										7 years
Hewlett-Packard | Supplier Concentration Risk | Sales Revenue, Goods, Net
Business And Summary Of Significant Accounting Policies [Line Items]
Concentration risk, percentage										19.00%	21.00%	21.00%
Apple | Supplier Concentration Risk | Sales Revenue, Goods, Net
Business And Summary Of Significant Accounting Policies [Line Items]
Concentration risk, percentage										15.00%	13.00%	12.00%
Accrued Expenses and Other Liabilities
Business And Summary Of Significant Accounting Policies [Line Items]
Loss Contingency Accrual					56,400,000						56,400,000
Europe
Business And Summary Of Significant Accounting Policies [Line Items]
Operating Expenses, Restatement and Remediation Related										$ 18,100,000	$ 40,600,000