Income Taxes (Schedule Of Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Jan. 31, 2019	Oct. 31, 2018	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018
USTaxActImpactOnUSFederalTaxRate_TaxExpense [Line Items]
USTaxActImpactOnUSFederalTaxRate					$ 95.4
USTaxActImpactOnUSFederalTaxRate_TaxExpense	$ (25.2)	$ (24.0)		$ (49.2)	101.1
USTaxActImpactOnUSFederalTaxRate_TaxBenefit					$ 5.7
U.S. statutory rate			21.00%	21.00%	33.80%
State income taxes, net of federal benefit			1.70%	2.20%	1.10%
Net changes in deferred tax valuation allowances			1.40%	(0.90%)	1.20%
Tax on foreign earnings different than U.S. rate			1.20%	(0.60%)	(5.80%)
Impact of Avnet Settlement Agreement			0.00%	(4.00%)	0.00%
Nondeductible Indemnities			0.10%	0.80%	0.40%
Nondeductible goodwill			0.00%	2.90%	0.00%
Reversal of previously accrued income tax reserves			(0.90%)	(2.00%)	(0.70%)
Interest not subject to tax, net			(0.90%)	(0.60%)	(1.30%)
Effect of company-owned life insurance			(0.30%)	0.10%	(1.00%)
Global Intangible Low-Taxed Income			0.10%	1.00%	0.00%
U.S. Tax Reform transition tax			0.00%	(13.20%)	33.80%
U.S. Tax Reform impact of rate change on deferred taxes			0.00%	0.00%	(1.90%)
Other, net			(0.70%)	2.10%	1.40%
Effective tax rate			22.70%	8.80%	61.00%