SUMMARY OF ACCOUNTING POLICIES - Goodwill (Details)	3 Months Ended	12 Months Ended
Mar. 31, 2018 USD ($) segment	Mar. 31, 2018 USD ($) segment	Mar. 31, 2017 USD ($) business
Goodwill [Line Items]
Number of reportable units \| segment		4
Number of operating segments \| segment	4	4
Impairment charges		$ 0	$ 0
Activity in goodwill account
Balance, beginning of the period		984,867,000
Balance, end of the period	$ 1,121,170,000	1,121,170,000	$ 984,867,000
Number of non-core businesses sold \| business			2
Operating segments
Activity in goodwill account
Balance, beginning of the period		984,867,000	$ 942,066,000
Additions		85,024,000	63,842,000
Divestitures		(3,475,000)	(4,427,000)
Purchase accounting adjustments		(14,000)	794,000
Foreign currency translation adjustments		54,768,000	(17,408,000)
Balance, end of the period	1,121,170,000	1,121,170,000	984,867,000
Operating segments \| High Reliability Solutions
Activity in goodwill account
Balance, beginning of the period		420,935,000	439,336,000
Additions		75,280,000	0
Divestitures		0	(1,787,000)
Purchase accounting adjustments		0	794,000
Foreign currency translation adjustments		54,768,000	(17,408,000)
Balance, end of the period	550,983,000	550,983,000	420,935,000
Operating segments \| Consumer Technologies Group
Activity in goodwill account
Balance, beginning of the period		111,223,000	68,234,000
Additions		0	42,989,000
Divestitures		(3,475,000)	0
Purchase accounting adjustments		0	0
Foreign currency translation adjustments		0	0
Balance, end of the period	107,748,000	107,748,000	111,223,000
Operating segments \| Industrial & Emerging Industries
Activity in goodwill account
Balance, beginning of the period		337,707,000	322,803,000
Additions		0	17,544,000
Divestitures		0	(2,640,000)
Purchase accounting adjustments		0	0
Foreign currency translation adjustments		0	0
Balance, end of the period	337,707,000	337,707,000	337,707,000
Operating segments \| Communications Enterprise Compute (CEC)
Activity in goodwill account
Balance, beginning of the period		115,002,000	111,693,000
Additions		9,744,000	3,309,000
Divestitures		0	0
Purchase accounting adjustments		(14,000)	0
Foreign currency translation adjustments		0	0
Balance, end of the period	$ 124,732,000	124,732,000	$ 115,002,000
Operating segments \| IEI and HRS Segments
Activity in goodwill account
Divestitures		(4,400,000)
Disposed of by Sale \| Wink Labs Inc \| Operating segments \| Consumer Technologies Group
Activity in goodwill account
Divestitures		$ (3,500,000)

Represents the number of non-core businesses finalized to be sold by the entity.

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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

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-Publisher FASB
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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of divestiture of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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- Definition

Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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Number of reporting units tested for impairment of goodwill. A reporting unit is an operating segment or one level below an operating segment.

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