Schedule of Valuation and Qualifying Accounts and Reserves (Details) - USD ($) $ in Millions		12 Months Ended
		Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015
Accounts Receivable: Allowance for Doubtful Accounts [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation Allowances and Reserves, Balance at beginning of period		$ 3.2	$ 1.8	$ 1.9
Valuation Allowances and Reserves, Charged to Cost and Expense		3.8	4.4	1.9
Valuation Allowances and Reserves, Charged to Other Accounts		0.0	0.0	0.0
Valuation Allowances and Reserves, Deductions	[1]	5.1	3.0	2.0
Valuation Allowances and Reserves, Balance at end of period		1.9	3.2	1.8
Accounts Receivable: Allowance for Sales Returns [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation Allowances and Reserves, Balance at beginning of period		8.3	8.8	8.5
Valuation Allowances and Reserves, Charged to Cost and Expense		2.5	3.5	1.9
Valuation Allowances and Reserves, Charged to Other Accounts		0.0	0.0	0.0
Valuation Allowances and Reserves, Deductions	[2]	1.2	4.0	1.6
Valuation Allowances and Reserves, Balance at end of period		9.6	8.3	8.8
Allowance for inventory liquidation and obsolescence [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation Allowances and Reserves, Balance at beginning of period		59.2	63.2	64.1
Valuation Allowances and Reserves, Charged to Cost and Expense		19.2	25.4	33.6
Valuation Allowances and Reserves, Charged to Other Accounts		0.0	0.0	0.0
Valuation Allowances and Reserves, Deductions	[3]	13.0	29.4	34.5
Valuation Allowances and Reserves, Balance at end of period		65.4	59.2	63.2
Allowance for inventory shrinkage [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation Allowances and Reserves, Balance at beginning of period		1.2	2.2	1.5
Valuation Allowances and Reserves, Charged to Cost and Expense		0.5	0.8	2.6
Valuation Allowances and Reserves, Charged to Other Accounts		0.0	0.0	0.0
Valuation Allowances and Reserves, Deductions	[4]	0.7	1.8	1.9
Valuation Allowances and Reserves, Balance at end of period		1.0	1.2	2.2
Deferred Tax Valuation Allowance [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation Allowances and Reserves, Balance at beginning of period		19.5	16.2	17.7
Valuation Allowances and Reserves, Charged to Cost and Expense		5.0	5.3	4.0
Valuation Allowances and Reserves, Charged to Other Accounts		0.0	0.0	0.0
Valuation Allowances and Reserves, Deductions	[5]	0.4	2.0	5.5
Valuation Allowances and Reserves, Balance at end of period		$ 24.1	$ 19.5	$ 16.2

[1] Uncollectible accounts written off.

[2] Adjustment related to sales returns previously provided for.

[3] Liquidation of inventory previously written down to market.

[4] Physical inventory losses.

[5] Reversal of deferred tax valuation allowance and utilization of deferred tax loss carryforward.