- Condensed Consolidated Balance Sheet (Details) $ / shares in Units, $ in Thousands	Oct. 01, 2016 USD ($) $ / shares shares	Oct. 01, 2016 € / shares	Dec. 31, 2015 USD ($) $ / shares shares	Dec. 31, 2015 € / shares	Sep. 26, 2015 USD ($)	Dec. 27, 2014 USD ($)
Assets
Cash and cash equivalents	$ 362,700		$ 417,800		$ 506,500	$ 3,596,100
Accounts receivable, net of allowance for doubtful accounts of $5.7 million and $4.5 million, respectively	1,124,100		1,189,000
Inventories	884,600		898,700
Prepaid expenses and other current assets	250,600		286,100
Total current assets	2,622,000		2,791,600
Property, plant and equipment, net	881,300		886,200
Tysabri® royalty stream - at fair value (restated)	3,550,000		5,310,000
Goodwill and other indefinite-lived intangible assets	5,145,600		7,069,000
Other intangible assets, net	3,336,200		2,973,100
Non-current deferred income taxes	136,200		71,400
Other non-current assets	216,800		248,300
Total non-current assets	13,266,100		16,558,000
Total assets	15,888,100		19,349,600
Allowance for doubtful accounts	5,700		4,500
Liabilities and Shareholders’ Equity
Accounts payable	502,900		555,800
Payroll and related taxes	106,800		125,300
Accrued customer programs	324,300		396,000
Accrued liabilities	258,700		351,900
Accrued income taxes	55,100		62,700
Current indebtedness	265,000		1,060,500
Total current liabilities	1,512,800		2,552,200
Long-term debt, less current portion	5,638,000		4,971,600
Non-current deferred income taxes	798,000		1,372,700
Other non-current liabilities	456,700		346,300
Total non-current liabilities	6,892,700		6,690,600
Total liabilities	8,405,500		9,242,800
Commitments and contingencies - Note 14
Preferred shares, $0.0001 par value, 10 million shares authorized	0		0
Ordinary shares, €0.001 par value, 10 billion shares authorized	8,148,600		8,142,600
Accumulated other comprehensive income	71,500		(15,300)
Retained earnings (accumulated deficit)	(736,900)		1,980,100
Total controlling interest	7,483,200		10,107,400
Noncontrolling interest	(600)		(600)
Total shareholders’ equity	7,482,600		10,106,800
Total liabilities and shareholders' equity	$ 15,888,100		$ 19,349,600
Preferred shares, par value (in dollars per share) | $ / shares	$ 0.0001		$ 0.0001
Preferred shares, authorized (in shares) | shares	10,000,000		10,000,000
Ordinary shares, par value (in dollars per share) | € / shares		€ 0.001		€ 0.001
Ordinary shares, authorized (in shares) | shares	10,000,000,000		10,000,000,000
Previously Reported
Assets
Cash and cash equivalents	$ 362,700		$ 417,800		506,500	3,596,100
Accounts receivable, net of allowance for doubtful accounts of $5.7 million and $4.5 million, respectively	1,129,200		1,193,100
Inventories	884,600		844,400
Prepaid expenses and other current assets	250,600		289,100
Total current assets	2,627,100		2,744,400
Property, plant and equipment, net	881,300		886,200
Tysabri® royalty stream - at fair value (restated)	0		0
Goodwill and other indefinite-lived intangible assets	5,282,700		7,281,200
Other intangible assets, net	8,340,900		8,190,500
Non-current deferred income taxes	129,300		54,600
Other non-current assets	206,300		237,000
Total non-current assets	14,840,500		16,649,500
Total assets	17,467,600		19,393,900
Allowance for doubtful accounts	5,700		4,500
Liabilities and Shareholders’ Equity
Accounts payable	507,900		554,900
Payroll and related taxes	106,800		125,300
Accrued customer programs	325,500		398,000
Accrued liabilities	258,700		308,400
Accrued income taxes	76,200		85,200
Current indebtedness	265,000		1,018,300
Total current liabilities	1,540,100		2,490,100
Long-term debt, less current portion	5,638,000		4,971,600
Non-current deferred income taxes	1,169,300		1,563,700
Other non-current liabilities	448,900		332,400
Total non-current liabilities	7,256,200		6,867,700
Total liabilities	8,796,300		9,357,800
Commitments and contingencies - Note 14
Preferred shares, $0.0001 par value, 10 million shares authorized	0		0
Ordinary shares, €0.001 par value, 10 billion shares authorized	8,151,400		8,144,600
Accumulated other comprehensive income	71,500		(15,500)
Retained earnings (accumulated deficit)	449,000		1,907,600
Total controlling interest	8,671,900		10,036,700
Noncontrolling interest	(600)		(600)
Total shareholders’ equity	8,671,300		10,036,100
Total liabilities and shareholders' equity	$ 17,467,600		$ 19,393,900
Preferred shares, par value (in dollars per share) | $ / shares			$ 0.0001
Preferred shares, authorized (in shares) | shares			10,000,000
Ordinary shares, par value (in dollars per share) | € / shares		€ 0.001		€ 0.001
Ordinary shares, authorized (in shares) | shares	10,000,000,000		10,000,000,000
Adjustments | Tysabri®
Assets
Cash and cash equivalents	$ 0		$ 0		0	0
Accounts receivable, net of allowance for doubtful accounts of $5.7 million and $4.5 million, respectively	0		0
Inventories	0		0
Prepaid expenses and other current assets	0		0
Total current assets	0		0
Property, plant and equipment, net	0		0
Tysabri® royalty stream - at fair value (restated)	3,550,000		5,310,000
Goodwill and other indefinite-lived intangible assets	0		0
Other intangible assets, net	(4,994,700)		(5,212,200)
Non-current deferred income taxes	0		0
Other non-current assets	0		0
Total non-current assets	(1,444,700)		97,800
Total assets	(1,444,700)		97,800
Allowance for doubtful accounts	0		0
Liabilities and Shareholders’ Equity
Accounts payable	0		0
Payroll and related taxes	0		0
Accrued customer programs	0		0
Accrued liabilities	0		0
Accrued income taxes	0		0
Current indebtedness	0		0
Total current liabilities	0		0
Long-term debt, less current portion	0		0
Non-current deferred income taxes	(180,600)		12,200
Other non-current liabilities	0		0
Total non-current liabilities	(180,600)		12,200
Total liabilities	(180,600)		12,200
Preferred shares, $0.0001 par value, 10 million shares authorized	0		0
Ordinary shares, €0.001 par value, 10 billion shares authorized	0		0
Accumulated other comprehensive income	0		0
Retained earnings (accumulated deficit)	(1,264,100)		85,600
Total controlling interest	(1,264,100)		85,600
Noncontrolling interest	0		0
Total shareholders’ equity	(1,264,100)		85,600
Total liabilities and shareholders' equity	(1,444,700)		97,800
Adjustments | Other
Assets
Cash and cash equivalents	0		0		$ 0	$ 0
Accounts receivable, net of allowance for doubtful accounts of $5.7 million and $4.5 million, respectively	(5,100)		(4,100)
Inventories	0		54,300
Prepaid expenses and other current assets	0		(3,000)
Total current assets	(5,100)		47,200
Property, plant and equipment, net	0		0
Tysabri® royalty stream - at fair value (restated)	0		0
Goodwill and other indefinite-lived intangible assets	(137,100)		(212,200)
Other intangible assets, net	(10,000)		(5,200)
Non-current deferred income taxes	6,900		16,800
Other non-current assets	10,500		11,300
Total non-current assets	(129,700)		(189,300)
Total assets	(134,800)		(142,100)
Allowance for doubtful accounts	0		0
Liabilities and Shareholders’ Equity
Accounts payable	(5,000)		900
Payroll and related taxes	0		0
Accrued customer programs	(1,200)		(2,000)
Accrued liabilities	0		43,500
Accrued income taxes	(21,100)		(22,500)
Current indebtedness	0		42,200
Total current liabilities	(27,300)		62,100
Long-term debt, less current portion	0		0
Non-current deferred income taxes	(190,700)		(203,200)
Other non-current liabilities	7,800		13,900
Total non-current liabilities	(182,900)		(189,300)
Total liabilities	(210,200)		(127,200)
Preferred shares, $0.0001 par value, 10 million shares authorized	0		0
Ordinary shares, €0.001 par value, 10 billion shares authorized	(2,800)		(2,000)
Accumulated other comprehensive income	0		200
Retained earnings (accumulated deficit)	78,200		(13,100)
Total controlling interest	75,400		(14,900)
Noncontrolling interest	0		0
Total shareholders’ equity	75,400		(14,900)
Total liabilities and shareholders' equity	(134,800)		(142,100)
Adjustments | BCH Deferred Tax Matters Misstatement
Assets
Goodwill and other indefinite-lived intangible assets	(231,200)		223,300
Non-current deferred income taxes	281,100		(272,200)
Liabilities and Shareholders’ Equity
Accrued income taxes	20,900
Non-current deferred income taxes	83,700		(65,400)
Adjustments | BCH Belgium Distribution Contracts Misstatement
Assets
Goodwill and other indefinite-lived intangible assets	5,400		10,200
Liabilities and Shareholders’ Equity
Accrued income taxes	5,500
Non-current deferred income taxes	100		$ 8,700
Adjustments | Adjustments to Income Taxes Accounted For Under ASC 740
Liabilities and Shareholders’ Equity
Accrued income taxes	$ 6,100