FINANCIAL STATEMENT SCHEDULE II (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jan. 31, 2015		Jan. 31, 2014		Jan. 31, 2013
Allowance for doubtful accounts
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at the Beginning of Year	$ 4.9		$ 5.6		$ 5.5
Valuation Allowances and Reserves, Charged to Cost and Expense	1.6		1.3		1.5
Deductions and Write-Offs	0.2		2.0		1.4
Balance at End of Year	6.3		4.9		5.6
Product returns reserves
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at the Beginning of Year	4.0		4.9		5.8
Valuation Allowances and Reserves, Charged to Cost and Expense	17.4		23.1		25.8
Deductions and Write-Offs	18.8		24.0		26.7
Balance at End of Year	2.6		4.0		4.9
Partner Program reserves
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at the Beginning of Year	38.4	[1]	48.3	[1]	36.5	[1]
Valuation Allowances and Reserves, Charged to Cost and Expense	237.3	[1]	278.6	[1]	286.9	[1]
Deductions and Write-Offs	239.2	[1]	288.5	[1]	275.1	[1]
Balance at End of Year	36.5	[1]	38.4	[1]	48.3	[1]
Restructuring
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at the Beginning of Year	5.6		8.9		2.4
Valuation Allowances and Reserves, Charged to Cost and Expense	3.2		12.8		45.1
Deductions and Write-Offs	7.2		16.1		38.6
Balance at End of Year	$ 1.6		$ 5.6		$ 8.9

[1] The partner program reserves balance impacts "Accounts receivable, net" and "Accounts payable" on the accompanying Consolidated Balance Sheets.