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Borrowings Components of long-term debt (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 27, 2016	Dec. 31, 2015	Apr. 30, 2015	Mar. 29, 2015
Debt Instrument [Line Items]
Total borrowings	$ 1,088,932	$ 1,088,941
Less: Unamortized debt discount on 3.875% Convertible Senior Subordinated Notes due 2017	(19,532)	(22,999)
Less: Unamortized debt issuance costs	(6,229)	(6,742)
Total long-term debt	1,063,171	1,059,200
Current borrowings	(421,198)	(417,350)
Long-term borrowings	$ 641,973	641,850
Debt instrument, stated interest rate	3.875%			3.875%
Revolving Credit Facility
Debt Instrument [Line Items]
Revolving credit facility, at a rate of 2.02% at March 27, 2016, due 2018	$ 396,000	$ 396,000
Line of credit facility interest rate	2.02%	2.02%
Securitization Program
Debt Instrument [Line Items]
Securitization program, at a rate of 1.19% at March 27, 2016	$ 43,300	$ 43,300
Debt instrument, stated interest rate	1.19%	1.19%
3.875% Convertible Senior Subordinated Notes due 2017 (1) \| Senior Notes
Debt Instrument [Line Items]
3.875% Convertible Senior Subordinated Notes due 2017 (1)	$ 399,632	$ 399,641
Debt instrument, stated interest rate	3.875%	3.875%
5.25% Senior Notes due 2024 \| Senior Notes
Debt Instrument [Line Items]
5.25% Senior Notes due 2024	$ 250,000	$ 250,000
Debt instrument, stated interest rate	5.25%	5.25%	5.25%