Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Apr. 30, 2015		Apr. 30, 2014		Jan. 31, 2015
Segment Reporting Information
Revenue, net	$ 5,887,229		$ 6,728,151
Operating income (loss)	81,938		31,496
Share-based compensation expense	(3,818)		(1,973)
Depreciation and amortization	14,179		18,216
Capital expenditures	7,244		4,227
Assets	5,905,976				6,136,725
Long-lived assets	63,099				63,104
Goodwill & acquisition-related intangible assets, net	313,439				317,968
Gain (Loss) Related to Litigation Settlement	38,511		0
Operating expenses, restatement and remediation related expenses	618		12,236
Americas
Segment Reporting Information
Revenue, net	2,339,260	[1]	2,476,271	[1]
Operating income (loss)	62,359	[2]	26,283	[2]
Depreciation and amortization	4,041		4,118
Sales to unaffiliated customers, as percentage of total sales	87.00%		83.00%
Capital expenditures	3,864		1,482
Assets	1,818,075				1,949,414
Long-lived assets	24,705				24,121
Goodwill & acquisition-related intangible assets, net	8,640				8,810
Long-lived assets, as percentage of total assets	93.00%				92.00%
Gain (Loss) Related to Litigation Settlement	38,511
Operating expenses, restatement and remediation related expenses			2,870
Europe
Segment Reporting Information
Revenue, net	3,547,969		4,251,880
Operating income (loss)	23,397	[3]	7,186	[3]
Depreciation and amortization	10,138		14,098
Capital expenditures	3,380		2,745
Assets	4,087,901				4,187,311
Long-lived assets	38,394				38,983
Goodwill & acquisition-related intangible assets, net	304,799				309,158
Operating expenses, restatement and remediation related expenses	$ 580		$ 9,366

[1] (1) Net sales to unaffiliated customers in the United States represented 87% and 83%, respectively, of the total Americas' net sales to unaffiliated customers for the three months ended April 30, 2015 and 2014. Total long-lived assets in the United States represented 93% and 92% of the Americas' total long-lived assets at April 30, 2015 and January 31, 2015, respectively.

[2] (2) Operating income in the Americas for the three months ended April 30, 2015 includes a gain related to LCD settlements of $38.5 million and for the three months ended April 30, 2014 includes restatement and remediation related expenses of $2.9 million.

[3] (3) Operating income in Europe for the three months ended April 30, 2015 and 2014 includes restatement and remediation related expenses of $0.6 million and $9.4 million, respectively.