Segment Information (Financial Information By Geographic Segment) (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	Jul. 31, 2013	Apr. 30, 2013	Oct. 31, 2012	Jul. 31, 2012	Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2013
Segment Reporting Information [Line Items]
Net sales	$ 7,339,491,000	$ 6,761,181,000	$ 6,841,809,000	$ 6,728,151,000	$ 7,973,107,000	$ 6,373,564,000	$ 6,327,476,000	$ 6,147,757,000			$ 27,670,632,000	$ 26,821,904,000	$ 25,358,329,000
Stock-based compensation expense											(13,668,000)	(8,858,000)	(13,616,000)
Operating income	101,684,000	66,745,000	67,710,000	31,496,000	97,743,000	63,880,000	29,859,000	36,031,000			267,635,000	227,513,000	263,720,000
Depreciation and amortization:											68,746,000	72,979,000	58,353,000
Capital expenditures											28,175,000	28,869,000	38,365,000
Identifiable assets	6,138,246,000				7,169,666,000						6,138,246,000	7,169,666,000
Long-lived assets	63,104,000				77,631,000						63,104,000	77,631,000
Goodwill and acquisition-related intangible assets, net	317,968,000				395,855,000						317,968,000	395,855,000
Gain (Loss) Related to Litigation Settlement		5,100,000			12,600,000	22,900,000					5,059,000	35,511,000	0
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
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount					(45,300,000)						(29,800,000)	(41,000,000)
Disposal Group, Not Discontinued Operation, Loss (Gain) on Write-down	1,330,000										1,330,000	0	0
Value added tax assessment											6,229,000	0	(29,462,000)
Europe
Segment Reporting Information [Line Items]
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	(19,200,000)										(19,200,000)	(45,300,000)	(25,100,000)
Value added tax assessment			(6,200,000)
Americas
Segment Reporting Information [Line Items]
Net sales											10,406,209,000	10,188,618,000	9,823,515,000
Operating income											145,107,000	156,143,000	150,055,000
Depreciation and amortization:											16,653,000	16,763,000	16,210,000
Capital expenditures											13,798,000	9,530,000	19,842,000
Identifiable assets	1,950,935,000				1,984,895,000						1,950,935,000	1,984,895,000
Long-lived assets	24,121,000				28,091,000						24,121,000	28,091,000
Goodwill and acquisition-related intangible assets, net	8,810,000				8,936,000						8,810,000	8,936,000
Gain (Loss) Related to Litigation Settlement											5,100,000	35,500,000
Operating Expenses, Restatement and Remediation Related											4,000,000	13,200,000
Americas | Geographic Concentration Risk | UNITED STATES | Sales Revenue, Segment
Segment Reporting Information [Line Items]
Concentration risk, percentage											85.00%	86.00%	85.00%
Americas | Geographic Concentration Risk | UNITED STATES | Assets, Total
Segment Reporting Information [Line Items]
Concentration risk, percentage											92.00%	90.00%
Europe
Segment Reporting Information [Line Items]
Net sales											17,264,423,000	16,633,286,000	15,534,814,000
Operating income											136,196,000	80,228,000	127,281,000
Depreciation and amortization:											52,093,000	56,216,000	42,143,000
Capital expenditures											14,377,000	19,339,000	18,523,000
Identifiable assets	4,187,311,000				5,184,771,000						4,187,311,000	5,184,771,000
Long-lived assets	38,983,000				49,540,000						38,983,000	49,540,000
Goodwill and acquisition-related intangible assets, net	309,158,000				386,919,000						309,158,000	386,919,000
Operating Expenses, Restatement and Remediation Related											18,100,000	40,600,000
SPAIN
Segment Reporting Information [Line Items]
Value added tax assessment											6,200,000		(41,000,000)
Litigation Charge [Member] | SPAIN
Segment Reporting Information [Line Items]
Value added tax assessment													$ (29,500,000)