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Acquisitions (Narrative)(Details) - USD ($) $ in Millions |  | 6 Months Ended
--- | --- | ---
Jul. 03, 2018 | Jul. 31, 2018 | Jul. 31, 2017
Business Acquisition [Line Items] |  |  |
Document Period End Date |  | Jul. 31, 2018 |
Stock issued |  | $ 44.8 | $ 0.0
Assemble Systems Inc |  |  |
Business Acquisition [Line Items] |  |  |
Consideration | $ 93.6 |  |
Payments to acquire businesses | 38.2 |  |
Stock issued | $ 44.8 |  |
Stock issued (shares) | 340,769 |  |
Equity interest prior to acquisition | $ 10.6 |  |
Ownership percentage prior to acquisition | 14.00% |  |
Step acquisition remeasurement gain | $ 4.6 |  |

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- Definition Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=109124213&loc=d3e6613-128477 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109124213&loc=d3e6578-128477 + Details
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- Definition Fair value at acquisition-date of the assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interests issued by the acquirer, including but not limited to, instruments or interests issued or issuable in consideration for the business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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