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BUSINESS ACQUISITIONS AND DIVESTITURE - Brains On-Line, Additional Information (Details) - Brains On-Line $ in Thousands, € in Millions		12 Months Ended
	Aug. 04, 2017 USD ($)	Dec. 30, 2017 USD ($)	Aug. 04, 2017 EUR (€)	Aug. 04, 2017 USD ($)
Business Acquisition [Line Items]
Purchase price	$ 21,300
Contingent consideration			€ 6.7	$ 7,900
Purchase price allocation				$ 20,122
Cash acquired	$ 600
Transaction and integration costs		$ 2,600

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Business Combination, Integration Related Costs and Transaction Costs

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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Amount of liability recognized arising from contingent consideration in a business combination.

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Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed.

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The cash inflow associated with the acquisition of business during the period (for example, cash that was held by the acquired business).

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