SUMMARY OF ACCOUNTING POLICIES - Other Current Assets and Investments (Details) - USD ($) $ in Thousands	3 Months Ended				12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Jun. 29, 2018	Sep. 29, 2017	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Investments in non-consolidated companies	$ 294,100				$ 294,100	$ 411,100
Investment impairments and dispositions					193,063	21,895	$ 0
Gain on deconsolidation					86,614	151,574	0
Inventory impairment and other		$ 70,000					93,000
Asset-backed Securities
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Transferor's interests in transferred financial assets	292,500				292,500	445,400
Elementum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Gain on deconsolidation				$ 151,600
Derecognized cash						72,600
Variable interest						125,000
Inventory impairment and other	84,000
RIB Software AG [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Contributions for non-controlling interest in joint venture							60,000
Proceeds from sale of non-controlling interest in joint venture		$ 48,400
Unrelated Third-Party Company
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Gain on deconsolidation					76,000
Bright Machines
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Investments in non-consolidated companies			$ 127,600
Gain on deconsolidation					87,000
Transfer of employees and equipment, net book value			$ 35,000
Capital lease asset	30,300				30,300
Capital lease obligation	$ 34,828				$ 34,828	$ 0	$ 0