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ACQUISITIONS - Narrative (Details) - USD ($) $ in Thousands |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 03, 2018 | Jan. 26, 2018 | Jul. 31, 2017 | Apr. 30, 2016 | Sep. 29, 2018 | Sep. 29, 2018 | Dec. 30, 2017 | Jan. 31, 2019
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | $ 389,594 | $ 389,594 | $ 337,720 |
Walpar, LLC [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Percentage acquired | 72.00% |  |  |  |  |  |  |
Consideration transfered | $ 57,805 |  |  |  |  |  |  |
Goodwill | $ 40,919 |  |  |  |  |  |  |
Convert Italia S.p.A |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Percentage acquired | 75.00% |  |  |  |  |  |  |
Consideration transfered | $ 43,504 |  |  |  |  |  |  |
Contingent consideration liability | 18,760 |  |  |  |  |  |  |
Goodwill | 41,432 |  |  |  |  |  |  |
Derit Infrastructure Pvt. Ltd. [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Consideration transfered | $ 14,700 |  |  |  |  |  |  |
Torrent Engineering and Equipment |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Percentage acquired |  | 60.00% |  |  |  |  |  |
Consideration transfered |  | $ 4,800 |  |  |  |  |  |
Goodwill |  | 3,922 |  |  |  |  |  |
Annual revenue of acquiree |  | 9,000 |  |  |  |  |  |
Customer relationships and other intangible assets |  | $ 4,020 |  |  |  |  |  |
Aircon |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Consideration transfered |  |  | $ 5,362 |  |  |  |  |
Goodwill |  |  | 3,327 |  |  |  |  |
Annual revenue of acquiree |  |  | 10,000 |  |  |  |  |
Customer relationships and other intangible assets |  |  | $ 2,109 |  |  |  |  |
Walpart, Convert, and Torrent [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Revenue of acquiree since acquisition |  |  |  |  | 11,803 | 13,057 |  |
Net earnings of acquiree since acquisition |  |  |  |  | $ 1,198 | $ 1,055 |  |
IGC Galvanizing Industries (M) Sdn Bhd [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Percentage acquired |  |  |  | 10.00% |  |  |  |
Consideration transfered |  |  |  | $ 5,510 |  |  |  |
Scenario, Forecast [Member] | Walpar, LLC [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Percentage acquired |  |  |  |  |  |  |  | 28.00%
Customer Relationships |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  |  |  |  | 13 years | 13 years |
Customer Relationships | Walpar, LLC [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 14 years |  |  |  |  |  |  |
Patents & Proprietary Technology |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  |  |  |  | 14 years | 11 years |
Patents & Proprietary Technology | Convert Italia S.p.A |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 15 years |  |  |  |  |  |  |

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