Segment Information (Financial Information By Geographic Segment) (Details) (USD $)	3 Months Ended				6 Months Ended
	Jul. 31, 2014		Jul. 31, 2013		Jul. 31, 2014		Jul. 31, 2013		Jan. 31, 2014
Segment Reporting Information [Line Items]
Net sales	$ 6,841,809,000		$ 6,327,476,000		$ 13,569,960,000		$ 12,475,233,000
Operating Income (Loss)	67,710,000		29,859,000		99,206,000		65,890,000
Stock-based compensation expense	(3,869,000)		(2,227,000)		(5,842,000)		(5,318,000)
Depreciation and amortization	17,713,000		18,108,000		35,929,000		36,075,000
Capital expenditures	7,241,000		7,200,000		11,468,000		14,934,000
Identifiable assets	6,659,444,000				6,659,444,000				7,169,666,000
Long-lived assets	69,582,000				69,582,000				77,631,000
Goodwill and acquisition-related intangible assets, net	382,626,000				382,626,000				395,855,000
Restatement and remediation related expenses (Note 1)	5,378,000		10,963,000		17,614,000		13,986,000
Americas
Segment Reporting Information [Line Items]
Net sales	2,722,191,000	[1]	2,624,546,000	[1]	5,198,462,000	[1]	4,917,328,000	[1]
Operating Income (Loss)	38,854,000	[2]	31,988,000	[2]	65,137,000	[2]	59,219,000	[2]
Depreciation and amortization	4,188,000		4,251,000		8,306,000		8,497,000
Capital expenditures	3,370,000		1,921,000		4,852,000		3,618,000
Identifiable assets	2,170,773,000				2,170,773,000				1,984,895,000
Long-lived assets	22,258,000	[1]			22,258,000	[1]			28,091,000	[1]
Goodwill and acquisition-related intangible assets, net	9,150,000				9,150,000				8,936,000
Sales to unaffiliated customers, as percentage of total sales	87.00%		86.00%		85.00%		85.00%
Long-lived assets, as percentage of total assets	89.00%				89.00%				90.00%
Restatement and remediation related expenses (Note 1)	190,000		3,006,000		3,060,000		4,766,000
Europe
Segment Reporting Information [Line Items]
Accrual for Value Added Tax Matters Increase (Decrease)	6,200,000
Net sales	4,119,618,000		3,702,930,000		8,371,498,000		7,557,905,000
Operating Income (Loss)	32,725,000	[3],[4]	98,000	[3]	39,911,000	[3],[4]	11,989,000	[3]
Depreciation and amortization	13,525,000		13,857,000		27,623,000		27,578,000
Capital expenditures	3,871,000		5,279,000		6,616,000		11,316,000
Identifiable assets	4,488,671,000				4,488,671,000				5,184,771,000
Long-lived assets	47,324,000				47,324,000				49,540,000
Goodwill and acquisition-related intangible assets, net	373,476,000				373,476,000				386,919,000
Restatement and remediation related expenses (Note 1)	$ 5,188,000		$ 7,957,000		$ 14,554,000		$ 9,220,000

[1] Net sales to unaffiliated customers in the United States represented 87% and 86%, respectively, of the total Americas' net sales to unaffiliated customers for the three months ended July 31, 2014 and 2013. Net sales to unaffiliated customers in the United States represented 85% of the total Americas' net sales to unaffiliated customers for each of the six months ended July 31, 2014 and 2013. Total long-lived assets in the United States represented 89% and 90% of the Americas' total long-lived assets at July 31, 2014 and January 31, 2014, respectively.

[2] Operating income in the Americas for the three months ended July 31, 2014 and 2013 includes restatement and remediation related expenses of $0.2 million and $3.0 million, respectively. Operating income in the Americas for the six months ended July 31, 2014 and 2013 includes restatement and remediation related expenses of $3.1 million and $4.8 million, respectively.

[3] Operating income in Europe for the three months ended July 31, 2014 and 2013 includes restatement and remediation related expenses of $5.2 million and $8.0 million, respectively. Operating income in Europe for the six months ended July 31, 2014 and 2013 includes restatement and remediation related expenses of $14.6 million and $9.2 million, respectively.

[4] Operating income in Europe for the three and six months ended July 31, 2014 includes a decrease in an accrual for a value added tax assessment of $6.2 million in one of the Company's subsidiaries in Spain.