Revenue - Estimated future revenue (Details) $ in Thousands	Sep. 30, 2026 USD ($)
Revenue
Estimated future revenue	$ 614,436
Sales of fuel cell systems
Revenue
Estimated future revenue	36,079
Sale of hydrogen installations
Revenue
Estimated future revenue	19,854
Sales of electrolyzers
Revenue
Estimated future revenue	119,752
Sales of engineered equipment
Revenue
Estimated future revenue	353
Services performed on fuel cell systems and related infrastructure
Revenue
Estimated future revenue	123,062
Power purchase agreements
Revenue
Estimated future revenue	208,107
Fuel delivered to customers and related equipment
Revenue
Estimated future revenue	54,559
Sales of cryogenic equipment and liquefiers
Revenue
Estimated future revenue	51,468
Other
Revenue
Estimated future revenue	$ 1,202
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-07-01 \| Sales of fuel cell systems \| Minimum
Revenue
Estimated recognition period (years)	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-07-01 \| Sales of fuel cell systems \| Maximum
Revenue
Estimated recognition period (years)	2 years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-07-01 \| Sale of hydrogen installations \| Minimum
Revenue
Estimated recognition period (years)	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-07-01 \| Sale of hydrogen installations \| Maximum
Revenue
Estimated recognition period (years)	2 years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-07-01 \| Sales of electrolyzers \| Minimum
Revenue
Estimated recognition period (years)	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-07-01 \| Sales of electrolyzers \| Maximum
Revenue
Estimated recognition period (years)	3 years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-07-01 \| Sales of engineered equipment
Revenue
Estimated recognition period (years)	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-07-01 \| Services performed on fuel cell systems and related infrastructure \| Minimum
Revenue
Estimated recognition period (years)	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-07-01 \| Services performed on fuel cell systems and related infrastructure \| Maximum
Revenue
Estimated recognition period (years)	10 years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-07-01 \| Power purchase agreements \| Minimum
Revenue
Estimated recognition period (years)	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-07-01 \| Power purchase agreements \| Maximum
Revenue
Estimated recognition period (years)	10 years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-07-01 \| Fuel delivered to customers and related equipment \| Minimum
Revenue
Estimated recognition period (years)	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-07-01 \| Fuel delivered to customers and related equipment \| Maximum
Revenue
Estimated recognition period (years)	10 years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-07-01 \| Sales of cryogenic equipment and liquefiers
Revenue
Estimated recognition period (years)	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-07-01 \| Other \| Minimum
Revenue
Estimated recognition period (years)	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-07-01 \| Other \| Maximum
Revenue
Estimated recognition period (years)	2 years

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