BUSINESS AND ASSETS ACQUISITIONS (Details) $ in Thousands			3 Months Ended		9 Months Ended
	Sep. 28, 2015 USD ($)	Jun. 29, 2015 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2015 USD ($) acquisition	Dec. 31, 2014 USD ($)	Sep. 25, 2015 USD ($)	Mar. 31, 2015 USD ($)	Sep. 26, 2014 USD ($)	Mar. 31, 2014 USD ($)
Business Acquisition [Line Items]
Acquisition of businesses, net of cash acquired					$ 900,242	$ 58,132
Current assets:
Goodwill			$ 916,234		916,234			$ 333,631
Current liabilities:
Gross carrying amount			533,401		533,401			173,838
Acquisition related costs			8,000		8,000
Intangible amortization			19,319	$ 8,045	43,117	23,228
Potential contingent consideration			89,500	8,402	89,500	8,402	$ 4,500	4,500	$ 15,800	$ 11,300
Goodwill and intangibles			1,317,017		1,317,017			415,175
Net income			148,910	152,899	382,737	465,689
Pro forma net income			116,600	$ 146,900	341,600	$ 436,400
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount			$ (39,300)		(39,300)
Maximum time to complete final allocation of purchase price			12 months
Alcatel-Lucent
Business Acquisition [Line Items]
Acquisition of businesses, net of cash acquired			$ 67,500
Current assets:
Inventories			55,000		55,000
Property and equipment, net			10,000		10,000
Intangibles			2,100		2,100
Goodwill			3,600		3,600
Current liabilities:
Recognized identifiable assets acquired and liabilities assumed, net			(3,200)		(3,200)
2016 Acquisitions
Current liabilities:
Net income			29,500		34,400
Series of Individually Immaterial Business Acquisitions
Current assets:
Property and equipment, net			13,900		$ 13,900
Current liabilities:
Number of acquisitions completed | acquisition					6
Purchase consideration net cash					$ 42,100
Cash acquired from acquisitions					700
Assumed liabilities			27,300		27,300
Goodwill and intangibles			39,600		39,600
Mirror Controls International
Business Acquisition [Line Items]
Acquisition of businesses, net of cash acquired		$ 555,200
Cash acquired		27,700
Current assets:
Accounts receivable		41,392
Inventories		19,169
Other current assets		2,798
Total current assets		63,359
Property and equipment, net		38,875
Other assets		1,632
Intangibles		236,800
Goodwill		322,458
Total assets		663,124
Current liabilities:
Accounts payable		28,002
Accrued liabilities & other current liabilities		19,798
Total current liabilities		47,800
Other liabilities		60,166
Total aggregate purchase price		555,158
Acquisition related costs					6,600
Nextracker
Business Acquisition [Line Items]
Acquisition of businesses, net of cash acquired	$ 238,900
Current assets:
Accounts receivable	60,298
Inventories	3,235
Other current assets	19,272
Total current assets	82,805
Property and equipment, net	1,382
Other assets	70
Intangibles	100,500
Goodwill	250,330
Total assets	435,087
Current liabilities:
Accounts payable	17,226
Accrued liabilities & other current liabilities	57,075
Total current liabilities	74,301
Other liabilities	40,845
Total aggregate purchase price	319,941
Potential contingent consideration	97,200
Cash acquired from acquisitions	13,200
Liabilities accrued related to acquisition			81,000		81,000
Customer-related intangibles
Current liabilities:
Gross carrying amount			258,079		$ 258,079			133,853
Customer-related intangibles | Alcatel-Lucent
Current liabilities:
Weighted average useful life					5 years
Customer-related intangibles | Mirror Controls International
Current liabilities:
Gross carrying amount		$ 75,500
Weighted average useful life		10 years
Customer-related intangibles | Nextracker
Current liabilities:
Gross carrying amount	$ 44,600
Weighted average useful life	5 years
Licenses and other intangibles
Current liabilities:
Gross carrying amount			275,322		$ 275,322			39,985
Licenses and other intangibles | Mirror Controls International
Current liabilities:
Gross carrying amount		$ 161,300
Licenses and other intangibles | Nextracker
Current liabilities:
Gross carrying amount	$ 55,900
Weighted average useful life	6 years
HRS
Current assets:
Goodwill			418,854		$ 418,854			93,138
HRS | Series of Individually Immaterial Business Acquisitions
Current liabilities:
Number of acquisitions completed | acquisition					3
IEI
Current assets:
Goodwill			317,533		$ 317,533			64,221
IEI | Series of Individually Immaterial Business Acquisitions
Current liabilities:
Number of acquisitions completed | acquisition					2
CTG
Current assets:
Goodwill			68,234		$ 68,234			$ 68,234
CTG | Series of Individually Immaterial Business Acquisitions
Current liabilities:
Number of acquisitions completed | acquisition					1
Adjustment | Mirror Controls International
Current assets:
Intangibles			(43,200)		$ (43,200)
Goodwill			32,000		32,000
Current liabilities:
Intangible amortization			(2,300)
Decrease in deferred tax liabilities			$ (10,600)		$ (10,600)
Minimum | Adjustment | Mirror Controls International
Current liabilities:
Weighted average useful life			8 years
Maximum | Adjustment | Mirror Controls International
Current liabilities:
Weighted average useful life			10 years