RESTRUCTURING CHARGES - Provisions, Respective Payments and Remaining Accrued Balance (Details) - USD ($) $ in Thousands	3 Months Ended					12 Months Ended
	Mar. 31, 2018	Sep. 29, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Summarizes the provisions, respective payments, and remaining accrued balance
Balance at the beginning of the period						$ 23,501	$ 13,240	$ 15,057
Provision for charges incurred	$ 82,710	$ 7,981	$ 20,435	$ 17,421	$ 11,539	90,691	49,395	0
Balance at the end of the period	61,344		23,501			61,344	23,501	13,240
Less: Current portion (classified as other current liabilities)	61,344					61,344
Accrued restructuring costs, net of current portion (classified as other liabilities)	0					0
Fiscal Year 2014
Summarizes the provisions, respective payments, and remaining accrued balance
Cash payments for charges incurred								(1,817)
Fiscal Year 2017
Summarizes the provisions, respective payments, and remaining accrued balance
Provision for charges incurred							49,395
Fiscal Year 2018
Summarizes the provisions, respective payments, and remaining accrued balance
Provision for charges incurred						90,691
Severance
Summarizes the provisions, respective payments, and remaining accrued balance
Balance at the beginning of the period						16,359	11,905	13,363
Provision for charges incurred	61,458	7,981	13,782	16,932	11,539	69,439	42,253
Balance at the end of the period	48,006		16,359			48,006	16,359	11,905
Less: Current portion (classified as other current liabilities)	48,006					48,006
Accrued restructuring costs, net of current portion (classified as other liabilities)	0					0
Severance | Fiscal Year 2014
Summarizes the provisions, respective payments, and remaining accrued balance
Cash payments for charges incurred								(1,458)
Severance | Fiscal Year 2017
Summarizes the provisions, respective payments, and remaining accrued balance
Provision for charges incurred							42,253
Severance | Fiscal Year 2018
Summarizes the provisions, respective payments, and remaining accrued balance
Provision for charges incurred						69,439
Long-Lived Asset Impairment
Summarizes the provisions, respective payments, and remaining accrued balance
Balance at the beginning of the period						0	0	0
Provision for charges incurred	9,417	0				9,417
Balance at the end of the period	0		0			0	0	0
Less: Current portion (classified as other current liabilities)	0					0
Accrued restructuring costs, net of current portion (classified as other liabilities)	0					0
Long-Lived Asset Impairment | Fiscal Year 2014
Summarizes the provisions, respective payments, and remaining accrued balance
Cash payments for charges incurred								0
Long-Lived Asset Impairment | Fiscal Year 2017
Summarizes the provisions, respective payments, and remaining accrued balance
Provision for charges incurred							0
Long-Lived Asset Impairment | Fiscal Year 2018
Summarizes the provisions, respective payments, and remaining accrued balance
Provision for charges incurred						9,417
Other Exit Costs
Summarizes the provisions, respective payments, and remaining accrued balance
Balance at the beginning of the period						7,142	1,335	1,694
Provision for charges incurred	11,835	$ 0	6,653	$ 489	$ 0	11,835	7,142
Balance at the end of the period	13,338		$ 7,142			13,338	7,142	1,335
Less: Current portion (classified as other current liabilities)	13,338					13,338
Accrued restructuring costs, net of current portion (classified as other liabilities)	$ 0					0
Other Exit Costs | Fiscal Year 2014
Summarizes the provisions, respective payments, and remaining accrued balance
Cash payments for charges incurred								$ (359)
Other Exit Costs | Fiscal Year 2017
Summarizes the provisions, respective payments, and remaining accrued balance
Provision for charges incurred							7,142
Other Exit Costs | Fiscal Year 2018
Summarizes the provisions, respective payments, and remaining accrued balance
Provision for charges incurred						11,835
Cash Charges
Summarizes the provisions, respective payments, and remaining accrued balance
Provision for charges incurred						78,600
Cash Charges | Fiscal Year 2014
Summarizes the provisions, respective payments, and remaining accrued balance
Cash payments for charges incurred							(13,240)
Cash Charges | Fiscal Year 2017
Summarizes the provisions, respective payments, and remaining accrued balance
Cash payments for charges incurred						(16,908)	(25,894)
Cash Charges | Fiscal Year 2018
Summarizes the provisions, respective payments, and remaining accrued balance
Cash payments for charges incurred						(24,555)
Cash Charges | Severance | Fiscal Year 2014
Summarizes the provisions, respective payments, and remaining accrued balance
Cash payments for charges incurred							(11,905)
Cash Charges | Severance | Fiscal Year 2017
Summarizes the provisions, respective payments, and remaining accrued balance
Cash payments for charges incurred						(13,237)	(25,894)
Cash Charges | Severance | Fiscal Year 2018
Summarizes the provisions, respective payments, and remaining accrued balance
Cash payments for charges incurred						(24,555)
Cash Charges | Long-Lived Asset Impairment | Fiscal Year 2014
Summarizes the provisions, respective payments, and remaining accrued balance
Cash payments for charges incurred							0
Cash Charges | Long-Lived Asset Impairment | Fiscal Year 2017
Summarizes the provisions, respective payments, and remaining accrued balance
Cash payments for charges incurred						0	0
Cash Charges | Long-Lived Asset Impairment | Fiscal Year 2018
Summarizes the provisions, respective payments, and remaining accrued balance
Cash payments for charges incurred						0
Cash Charges | Other Exit Costs | Fiscal Year 2014
Summarizes the provisions, respective payments, and remaining accrued balance
Cash payments for charges incurred							(1,335)
Cash Charges | Other Exit Costs | Fiscal Year 2017
Summarizes the provisions, respective payments, and remaining accrued balance
Cash payments for charges incurred						(3,671)	$ 0
Cash Charges | Other Exit Costs | Fiscal Year 2018
Summarizes the provisions, respective payments, and remaining accrued balance
Cash payments for charges incurred						0
Non-Cash Charges | Fiscal Year 2018
Summarizes the provisions, respective payments, and remaining accrued balance
Cash payments for charges incurred						(11,385)
Non-Cash Charges | Severance | Fiscal Year 2018
Summarizes the provisions, respective payments, and remaining accrued balance
Cash payments for charges incurred						0
Non-Cash Charges | Long-Lived Asset Impairment | Fiscal Year 2018
Summarizes the provisions, respective payments, and remaining accrued balance
Cash payments for charges incurred						(9,417)
Non-Cash Charges | Other Exit Costs | Fiscal Year 2018
Summarizes the provisions, respective payments, and remaining accrued balance
Cash payments for charges incurred						$ (1,968)