Income Taxes Effective income tax rate (Details)	6 Months Ended	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2016	Jun. 27, 2015	Jun. 28, 2014
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Provision at statutory rate	12.50%	12.50%	12.50%	12.50%
Ireland tax on non-trading differences	(207.40%)	(0.40%)	(9.90%)	2.60%
Expenses not deductible for tax purposes/deductions not expensed for book, net	394.00%	(0.70%)	14.70%	10.90%
Goodwill impairment not deductible for tax purposes	0.00%	(2.80%)	0.00%	0.00%
State income taxes, net of federal benefit	38.40%	0.10%	(1.00%)	(0.20%)
Foreign tax credit	0.00%	0.00%	0.00%	0.20%
Research and development credit	(13.20%)	(0.00%)	(0.70%)	(0.40%)
Other	112.30%	0.40%	4.80%	(0.90%)
Other foreign differences (earnings taxed at other than applicable statutory rate)	(647.20%)	3.30%	(16.10%)	(14.50%)
Intangible Impairment differences	(397.60%)	4.80%	0.00%	0.00%
Valuation allowance changes	249.30%	0.80%	25.70%	2.60%
Change in unrecognized taxes	82.70%	(0.80%)	17.70%	13.50%
Rate change impacts	0.00%	0.00%	0.00%	(3.00%)
Effective income tax rate	(376.20%)	17.20%	47.70%	23.30%