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Acquisitions - Narrative (Details) - USD ($) |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jul. 01, 2017 | Mar. 04, 2015 | Sep. 30, 2015 | Mar. 31, 2015 | Jul. 31, 2016 | Jan. 28, 2018 | Jan. 29, 2017 | Jan. 31, 2016
Fair value of earn-out liability |  |  |  |  |  | $ 21,668,000 | $ 1,242,000 |
Borrowings under line of credit |  |  |  | $ 35,000,000 |  | 0 | 97,000,000 | $ 0
Goodwill |  |  |  |  |  | 341,897,000 | 329,703,000 |
AptoVision |  |  |  |  |  |  |  |
Effective date of acquisition | Jul. 01, 2017 |  |  |  |  |  |  |
Name of acquired entity | AptoVision Technologies Inc. |  |  |  |  |  |  |
Cash paid to acquire business | $ 17,600,000 |  |  |  |  |  |  |
Fair value of earn-out liability |  |  |  |  |  | 21,000,000 | $ 0 |
Earn-out liability | 21,000,000 |  |  |  |  |  |  |
Goodwill | 12,194,000 |  |  |  |  | 12,194,000 |  |
Triune Systems |  |  |  |  |  |  |  |
Effective date of acquisition |  | Mar. 04, 2015 |  |  |  |  |  |
Name of acquired entity |  | Triune Systems, L.L.C. |  |  |  |  |  |
Purchase price |  | $ 45,000,000 |  |  |  |  |  |
Cash paid to acquire business |  | 35,000,000 | $ 9,500,000 |  | $ 500,000 |  |  |
Remaining cash consideration to be paid |  | 10,000,000 |  |  |  |  |  |
Fair value of earn-out liability |  |  |  |  |  | 0 |  |
Goodwill expected to be deductible for tax purposes |  |  |  |  |  | $ 16,100,000 |  |
Earn-out liability |  | 16,200,000 |  |  |  |  |  |
Earn-out Payable Within First Three Fiscal Years Of Acquisition Date [Member] | AptoVision |  |  |  |  |  |  |  |
Potential payments under earn-out arrangements, high estimate | $ 47,000,000 |  |  |  |  |  |  |
Period over which contingent consideration will be paid | 3 years |  |  |  |  |  |  |
Earn-out Payable Within First Three Fiscal Years Of Acquisition Date [Member] | Triune Systems |  |  |  |  |  |  |  |
Potential payments under earn-out arrangements, high estimate |  | $ 70,000,000 |  |  |  |  |  |
Period over which contingent consideration will be paid |  | 3 years |  |  |  |  |  |
Additional Earn-out Payable After Third Fiscal Year From Acquisition Date [Member] | Triune Systems |  |  |  |  |  |  |  |
Potential payments under earn-out arrangements, high estimate |  | $ 16,000,000 |  |  |  |  |  |
Accrued liabilities | AptoVision |  |  |  |  |  |  |  |
Earn-out liability | $ 8,900,000 |  |  |  |  |  |  |
Other long-term liabilities | AptoVision |  |  |  |  |  |  |  |
Earn-out liability | 12,100,000 |  |  |  |  |  |  |
Selling, general and administrative expenses | AptoVision |  |  |  |  |  |  |  |
Acquisition related transaction costs | $ 1,600,000 |  |  |  |  |  |  |

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- Definition Date when the acquirer obtains control of the acquiree, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e845-128460 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e848-128460 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e1043-128460 + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 + Details
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