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9. Debt (Details)
$ in Thousands, ₨ in Billions
1 Months Ended 3 Months Ended
Jun. 30, 2023
USD ($)
Mar. 31, 2024
USD ($)
Feb. 29, 2024
USD ($)
Feb. 29, 2024
INR (₨)
Dec. 31, 2023
USD ($)
Dec. 31, 2023
INR (₨)
Jul. 27, 2022
USD ($)
Debt              
Total debt principal   $ 620,090     $ 560,827    
Less: unamortized issuance costs   (488)     (521)    
Total debt   619,602     560,306    
Current portion of debt   200,907     96,238    
Noncurrent portion of debt   $ 418,695     464,068    
Short-term debt, weighted-average interest rate   8.76%          
Total Debt, Fiscal Year Maturity              
Total Debt, Maturity, Remainder of Fiscal Year   $ 155,540          
Total Debt, Maturity, Year One   90,900          
Total Debt, Maturity, Year Two   90,900          
Total Debt, Maturity, Year Three   90,950          
Total Debt, Maturity, Year Four   91,000          
Total Debt, Maturity, Year Five   100,800          
Total Debt, Maturity, after Year Five   $ 0          
Revolving Credit Facility              
Debt              
Debt instrument, currency   USD          
Revolving credit facility   $ 0     0    
Line of Credit Facility, Current Borrowing Capacity $ 1,000,000            
Debt Instrument, Description of Variable Rate Basis Borrowings under the Revolving Credit Facility bear interest at a rate per annum equal to, at our option, (i) the Term Secured Overnight Financing Rate (“Term SOFR”), plus a credit spread of 0.10%, plus a margin that ranges from 1.25% to 2.25% or (ii) an alternate base rate as defined in the credit agreement, plus a margin that ranges from 0.25% to 1.25%.            
Revolving Credit Facility | Minimum [Member]              
Debt              
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.125%            
Revolving Credit Facility | Maximum [Member]              
Debt              
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.375%            
India Credit Facility              
Debt              
Debt instrument, currency   USD          
Long-term debt, gross   $ 500,000     500,000    
India Credit Facility | DFC              
Debt              
Debt Instrument, Description of Variable Rate Basis   U.S. Treasury Constant Maturity Yield plus 1.75%          
Debt Instrument, Basis Spread on Variable Rate   1.75%          
Long-term debt, weighted-average interest rate   5.57%          
India Credit Facility | DFC | FS India Solar Ventures Private Limited              
Debt              
Line of Credit Facility, Current Borrowing Capacity             $ 500,000
India JPM Working Capital Facility              
Debt              
Debt instrument, currency   INR          
Short-term debt   $ 60,705     60,827    
India JPM Working Capital Facility | JPMorgan Chase Bank, N.A.              
Debt              
Debt Instrument, Description of Variable Rate Basis   India Treasury bill rate plus 2%          
Debt Instrument, Basis Spread on Variable Rate   2.00%          
Short-term debt, weighted-average interest rate   9.08%          
India JPM Working Capital Facility | JPMorgan Chase Bank, N.A. | FS India Solar Ventures Private Limited              
Debt              
Line of Credit Facility, Current Borrowing Capacity         74,800 ₨ 6.2  
India HSBC Working Capital Facility              
Debt              
Debt instrument, currency   INR          
Short-term debt   $ 59,385     $ 0    
India HSBC Working Capital Facility | Hong Kong and Shanghai Banking Corporation Limited              
Debt              
Debt Instrument, Description of Variable Rate Basis   India Treasury bill rate plus 1.5% to 1.6%          
Short-term debt, weighted-average interest rate   8.44%          
India HSBC Working Capital Facility | Hong Kong and Shanghai Banking Corporation Limited | Minimum [Member]              
Debt              
Debt Instrument, Basis Spread on Variable Rate   1.50%          
India HSBC Working Capital Facility | Hong Kong and Shanghai Banking Corporation Limited | Maximum [Member]              
Debt              
Debt Instrument, Basis Spread on Variable Rate   1.60%          
India HSBC Working Capital Facility | Hong Kong and Shanghai Banking Corporation Limited | FS India Solar Ventures Private Limited              
Debt              
Line of Credit Facility, Current Borrowing Capacity     $ 98,400 ₨ 8.2