BALANCE SHEET ITEMS - Goodwill and Other Intangible Assets (Details) $ in Thousands	9 Months Ended
Dec. 31, 2017 USD ($) segment	Mar. 31, 2017 USD ($)
Goodwill [Line Items]
Number of operating segments \| segment	4
Activity in goodwill account
Balance, beginning of the year	$ 984,867
Additions	84,454
Divestitures	(3,475)
Purchase accounting adjustments	(14)
Foreign currency translation adjustments	38,938
Balance, end of the period	1,104,770
Gross Carrying Amount	671,878	$ 544,601
Accumulated Amortization	(233,326)	(182,420)
Net Carrying Amount	438,552	362,181
HRS
Activity in goodwill account
Balance, beginning of the year	420,935
Additions	75,280
Divestitures	0
Purchase accounting adjustments	0
Foreign currency translation adjustments	38,938
Balance, end of the period	535,153
CTG
Activity in goodwill account
Balance, beginning of the year	111,223
Additions	0
Divestitures	(3,475)
Purchase accounting adjustments	0
Foreign currency translation adjustments	0
Balance, end of the period	107,748
IEI
Activity in goodwill account
Balance, beginning of the year	337,707
Additions	0
Divestitures	0
Purchase accounting adjustments	0
Foreign currency translation adjustments	0
Balance, end of the period	337,707
CEC
Activity in goodwill account
Balance, beginning of the year	115,002
Additions	9,174
Divestitures	0
Purchase accounting adjustments	(14)
Foreign currency translation adjustments	0
Balance, end of the period	124,162
Customer-related intangibles
Activity in goodwill account
Gross Carrying Amount	369,356	260,704
Accumulated Amortization	(135,411)	(105,912)
Net Carrying Amount	233,945	154,792
Licenses and other intangibles
Activity in goodwill account
Gross Carrying Amount	302,522	283,897
Accumulated Amortization	(97,915)	(76,508)
Net Carrying Amount	204,607	$ 207,389
Mirror Controls International \| HRS
Activity in goodwill account
Foreign currency translation adjustments	38,900
AGM Automotive
Activity in goodwill account
Balance, end of the period	75,280
Intangible assets acquired during period	82,000
AGM Automotive \| HRS
Activity in goodwill account
Intangible assets acquired during period	$ 82,000
AGM Automotive \| Customer-related intangibles \| HRS
Activity in goodwill account
Weighted average useful life	10 years
Power Modules
Activity in goodwill account
Balance, end of the period	$ 9,174
Intangible assets acquired during period	34,500
Power Modules \| CEC
Activity in goodwill account
Intangible assets acquired during period	$ 34,500
Weighted average useful life	9 years
Wink Labs Inc
Activity in goodwill account
Divestitures	$ (3,500)
Wink Labs Inc \| CTG
Activity in goodwill account
Decrease in intangible assets due to divestiture	$ 7,500

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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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