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Debt and Credit Sources - Narrative (Details)		1 Months Ended		3 Months Ended
Debt and Credit Sources - Narrative (Details)	Oct. 29, 2019 USD ($)	Dec. 31, 2015 USD ($) $ / shares shares	Jun. 29, 2014 shares	Mar. 29, 2020 USD ($) shares	Mar. 31, 2019 USD ($)	Dec. 29, 2019 USD ($)	Sep. 27, 2019 MW	Mar. 29, 2019 USD ($)	Jun. 28, 2018 USD ($)	Sep. 28, 2014 USD ($)	Jun. 30, 2014 USD ($) $ / shares	Sep. 30, 2011 USD ($)	Dec. 31, 2010 USD ($)
Debt Instrument [Line Items]
Debt face amount				$ 959,353,000		$ 1,045,966,000
Payments for Repurchase of Convertible Preferred Stock				87,141,000	$ 0
Non-recourse financing arrangements				$ 19,100,000
0.875% debentures due 2021
Debt Instrument [Line Items]
Interest rate				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
Payments for Repurchase of Convertible Preferred Stock				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%
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
Long-term line of credit				$ 101,000,000.0
CEDA loan
Debt Instrument [Line Items]
Debt face amount				30,000,000		30,000,000							$ 30,000,000.0
Debt, fair value				31,500,000
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		825,000,000
Convertible Debt \| 0.875% debentures due 2021
Debt Instrument [Line Items]
Interest rate			0.875%
Debt face amount				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
CEDA loan
Debt Instrument [Line Items]
Interest rate													8.50%
Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity				55,000,000.0
Revolving Credit Facility \| March 2019 Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity								$ 50,000,000.0
Long-term line of credit				27,900,000
Proceeds from lines of credit				12,400,000	9,000,000.0
Repayments of debt				3,700,000	$ 0
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
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
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
Current borrowing capacity									$ 75,000,000.0