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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Net Investment Hedge (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Mar. 31, 2018 | Apr. 01, 2017 | Dec. 30, 2017
Derivative [Line Items] |  |  |  |
Realized gain on net investment hedge, net of tax |  |  |  | $ 3,150
Derivatives used in Net Investment Hedge, Net of Tax, Period Increase (Decrease) | $ (792) | $ (789) | $ (526) |
Foreign Currency Forward Contract |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, notional amount |  | 7,142 | $ 44,000 |
Unrealized Gain (Loss) on Investments |  | 93 |  |
Australia, Dollars | Foreign Currency Forward Contract |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, notional amount |  | 24,059 |  |
United Kingdom, Pounds | Foreign Currency Forward Contract |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, notional amount |  | $ 21,222 |  |

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- Definition Amount of increase (decrease) in the cumulative translation adjustment from gain (loss), after tax, on foreign currency derivatives, that are designated as, and are effective as, economic hedges of a net investment in a foreign entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -Subparagraph (b),(c),(d) -URI http://asc.fasb.org/extlink&oid=64808268&loc=d3e32211-110900 + Details
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