Income Taxes (Schedule Of Significant Components Of Deferred Tax Liabilities And Assets) (Details) - USD ($) $ in Thousands	Jan. 31, 2018	Jan. 31, 2017
Income Tax Disclosure [Abstract]
Depreciation and amortization	$ 106,560	$ 48,910
Capitalized marketing program costs	6,104	7,525
Goodwill	16,496	7,581
Deferred costs currently deductible	7,558	4,110
Other, net	12,540	5,241
Total deferred tax liabilities	149,258	73,367
Accrued liabilities	54,970	41,509
Loss carryforwards	127,881	92,338
Amortizable goodwill	1,377	2,191
Depreciation and amortization	13,997	4,547
Disallowed interest expense	11,057	6,249
Acquisition and transaction related costs	3,823	5,605
Other, net	14,527	10,928
Deferred tax assets, gross, total	227,632	163,367
Less: valuation allowances	(80,714)	(46,764)
Total deferred tax assets	146,918	116,603
Net deferred tax (liability) asset	$ (2,340)	$ 43,236