BALANCE SHEET ITEMS - Goodwill and Other Intangible Assets (Details) $ in Thousands	9 Months Ended
Dec. 31, 2016 USD ($) business segment	Mar. 31, 2016 USD ($)
Goodwill [Line Items]
Number of operating segments \| segment	4
Activity in goodwill account
Divestitures	$ (4,400)
Number of non-strategic business \| business	2
Gross Carrying Amount	$ 534,731	$ 508,099
Accumulated Amortization	(163,128)	(104,345)
Net Carrying Amount	371,603	403,754
Customer-related intangibles
Activity in goodwill account
Gross Carrying Amount	254,991	223,046
Accumulated Amortization	(96,655)	(66,473)
Net Carrying Amount	158,336	156,573
Licenses and other intangibles
Activity in goodwill account
Gross Carrying Amount	279,740	285,053
Accumulated Amortization	(66,473)	(37,872)
Net Carrying Amount	213,267	$ 247,181
Operating Segments
Activity in goodwill account
Balance, beginning of the year	942,066
Additions	57,518
Divestitures	(4,427)
Purchase accounting adjustments	794
Foreign currency translation adjustments	(30,233)
Balance, end of the period	965,718
Operating Segments \| HRS
Activity in goodwill account
Balance, beginning of the year	439,336
Additions	0
Divestitures	(1,787)
Purchase accounting adjustments	794
Foreign currency translation adjustments	(30,233)
Balance, end of the period	$ 408,110
Number of non-strategic business \| business	2
Operating Segments \| CTG
Activity in goodwill account
Balance, beginning of the year	$ 68,234
Additions	39,791
Divestitures	0
Purchase accounting adjustments	0
Foreign currency translation adjustments	0
Balance, end of the period	108,025
Operating Segments \| IEI
Activity in goodwill account
Balance, beginning of the year	322,803
Additions	17,727
Divestitures	(2,640)
Purchase accounting adjustments	0
Foreign currency translation adjustments	0
Balance, end of the period	337,890
Operating Segments \| CEC
Activity in goodwill account
Balance, beginning of the year	111,693
Additions	0
Divestitures	0
Purchase accounting adjustments	0
Foreign currency translation adjustments	0
Balance, end of the period	111,693
Mirror Controls International \| Operating Segments \| HRS
Activity in goodwill account
Foreign currency translation adjustments	$ 30,200

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

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- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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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.

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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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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of increase (decrease) from foreign currency translation adjustments 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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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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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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