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Restructuring charges and other facility exit costs, net (Details) $ in Millions | 12 Months Ended
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Jan. 31, 2017 USD ($) Facility Position | Jan. 31, 2016 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Additions |  | $ 77.8 |  | $ 0.0 |
Restructuring Reserve [Roll Forward] |  |  |  |  |
Total, beginning balance |  | 1.3 |  | 1.6 |
Current portion, beginning balance |  | 0.8 | [1] | 0.7 | [2]
Non-current portion, beginning balance |  | 0.5 | [1] | 0.9 | [2]
Additions |  | 77.8 |  | 0.0 |
Payments |  | (67.6) |  | (0.5) |
Adjustments |  | (3.1) | [3] | 0.2 | [4]
Total, ending balance |  | 8.4 |  | 1.3 |
Current portion, ending balance | [1] | 6.6 |  | 0.8 |
Non-current portion, ending balance | [1] | 1.8 |  | 0.5 |
Total |  | $ 1.3 |  | 1.6 |
One-time Termination Benefits | Fiscal 2017 Plan |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Number of positions eliminated | Position |  | 840 |  |  |
Facility Closing |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Additions |  | $ 7.4 |  |  |
Lease termination and other exit costs |  | 9.6 |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |
Total, beginning balance |  | 0.0 |  |  |
Additions |  | 7.4 |  |  |
Payments |  | (1.8) |  |  |
Adjustments |  | (1.1) |  |  |
Total, ending balance |  | 4.5 |  | 0.0 |
Total |  | $ 0.0 |  | 0.0 |
Facility Closing | Fiscal 2017 Plan |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Number of facilities consolidated | Facility |  | 18 |  |  |
Additions |  | $ 7.1 |  |  |
Lease termination and other exit costs |  | 7.6 |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |
Total, beginning balance |  |  |  |  |
Additions |  | 7.1 |  |  |
Payments |  | (3.2) |  |  |
Adjustments |  | (2.0) |  |  |
Total, ending balance |  | 1.9 |  |  |
Total |  |  |  |  |
Employee Severance | Fiscal 2017 Plan |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Additions |  | 63.3 |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |
Total, beginning balance |  | 0.0 |  |  |
Additions |  | 63.3 |  |  |
Payments |  | (62.2) |  |  |
Adjustments |  | 0.0 |  |  |
Total, ending balance |  | 1.1 |  | 0.0 |
Total |  | 0.0 |  | 0.0 |
Lease Termination | Fiscal 2014 Plan |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Additions |  | 0.0 |  | 0.0 |
Restructuring Reserve [Roll Forward] |  |  |  |  |
Total, beginning balance |  | 1.2 |  | 1.4 |
Additions |  | 0.0 |  | 0.0 |
Payments |  | (0.3) |  | (0.4) |
Adjustments |  | 0.0 | [3] | 0.2 |
Total, ending balance |  | 0.9 |  | 1.2 |
Total |  | 1.2 |  | 1.4 |
Lease Termination | Fiscal 2013 Plan |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Additions |  | 0.0 |  | 0.0 |
Restructuring Reserve [Roll Forward] |  |  |  |  |
Total, beginning balance |  | 0.1 |  | 0.2 |
Additions |  | 0.0 |  | 0.0 |
Payments |  | (0.1) |  | (0.1) |
Adjustments |  | 0.0 |  | 0.0 |
Total, ending balance |  | 0.0 |  | 0.1 |
Total |  | $ 0.1 |  | $ 0.2 |
[1] | The current and non-current portions of the reserve are recorded in the Consolidated Balance Sheets under “Other accrued liabilities” and “Other liabilities,” respectively
[2] | The current and non-current portions of the reserve are recorded in the Consolidated Balance Sheets under “Other accrued liabilities” and “Other liabilities,” respectively.
[3] | Adjustments include the impact of change in estimates, computer equipment, software, furniture, straight-line rent and leasehold improvement write-offs, and foreign currency translation.
[4] | Adjustments include the impact of foreign currency translation.

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- Definition Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3536-108585 + Details
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