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Debt and Credit Sources - Narrative (Details)		1 Months Ended		3 Months Ended		6 Months Ended
Debt and Credit Sources - Narrative (Details)	Oct. 29, 2019 USD ($)	Dec. 31, 2015 USD ($) $ / shares shares	Jun. 29, 2014 shares	Jun. 28, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 28, 2020 USD ($) shares	Jun. 30, 2019 USD ($)	Dec. 29, 2019 USD ($)	Sep. 27, 2019 MW	Mar. 29, 2019 USD ($)	Jun. 28, 2018 USD ($)	Dec. 28, 2014 USD ($)	Sep. 28, 2014	Jun. 30, 2014 USD ($) $ / shares	Sep. 30, 2011 USD ($)	Dec. 31, 2010 USD ($)
Debt Instrument [Line Items]
Debt face amount				$ 957,671,000		$ 957,671,000		$ 1,045,966,000
Cash paid for repurchase of convertible debt						87,141,000	$ 0
Non-recourse financing arrangements				$ 20,000,000.0		$ 20,000,000.0
0.875% debentures due 2021
Debt Instrument [Line Items]
Interest rate				0.875%		0.875%								0.875%
Debt face amount														$ 400,000,000.0
Conversion ratio			20.5071
Debt instrument, convertible, conversion price (in dollars per share) \| $ / shares														$ 48.76
Convertible debt repurchased						$ 90,300,000
Cash paid for repurchase of convertible debt						87,100,000
Gain on extinguishment of debt						$ 3,000,000.0
0.875% debentures due 2021 \| Total
Debt Instrument [Line Items]
Debt face amount														$ 250,000,000.0
Shares to be acquired \| shares			5,126,775			3,969,375
Convertible debt repurchased						$ 56,400,000
4.00% debentures due 2023
Debt Instrument [Line Items]
Interest rate		4.00%		4.00%		4.00%
Debt face amount		$ 425,000,000.0
Debt instrument, convertible, conversion price (in dollars per share) \| $ / shares		$ 30.53
4.00% debentures due 2023 \| Total
Debt Instrument [Line Items]
Debt face amount		$ 100,000,000.0
Shares to be acquired \| shares		3,275,680
Safe Harbor Panels Inventory
Debt Instrument [Line Items]
Interest rate									7.50%
Inventory financed \| MW									200
Repayments of debt				$ 1,500,000		$ 1,500,000
Long-term line of credit				99,500,000		99,500,000
CEDA loan
Debt Instrument [Line Items]
Debt face amount				30,000,000		30,000,000		30,000,000								$ 30,000,000.0
Debt, fair value				30,800,000		30,800,000
Face Value Per Note
Debt Instrument [Line Items]
Debt face amount														$ 1,000
Convertible Debt
Debt Instrument [Line Items]
Debt face amount				734,698,000		734,698,000		825,000,000
Convertible Debt \| 0.875% debentures due 2021
Debt Instrument [Line Items]
Interest rate													0.875%
Debt face amount				309,698,000		309,698,000		400,000,000				$ 400.0
Convertible Debt \| 4.00% debentures due 2023
Debt Instrument [Line Items]
Debt face amount		$ 425,000,000.0		425,000,000		425,000,000		425,000,000
CEDA loan
Debt Instrument [Line Items]
Interest rate																8.50%
Revolving Credit Facility \| March 2019 Revolving Credit Facility
Debt Instrument [Line Items]
Repayments of debt				8,600,000		12,300,000	300,000
Line of credit facility, maximum borrowing capacity										$ 60,000,000.0
Long-term line of credit				28,000,000.0		28,000,000.0
Proceeds from lines of credit				8,700,000	$ 3,500,000	21,100,000	$ 12,500,000
Revolving Credit Facility \| Credit Agricole
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 55,000,000.0
Commitment fee	0.05%
Guaranty fee	0.25%
Fair market value limit on draws	67.00%
Revolving Credit Facility \| Credit Agricole \| Minimum \| London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread	0.25%
Revolving Credit Facility \| Credit Agricole \| Maximum \| London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread	0.60%
Letter of Credit \| Credit Agricole
Debt Instrument [Line Items]
Long-term line of credit				0		0		$ 0
Letter of Credit \| Deutsche Bank \| September 2011 Letter of Credit
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity															$ 200,000,000.0
Letters of credit outstanding, amount				3,600,000		3,600,000
Line of Credit \| SunTrust Bank \| June 2018 Facility Agreement With SunTrust Bank
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity				$ 75,000,000.0		$ 75,000,000.0
Current borrowing capacity											$ 75,000,000.0