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Revenue Recognition - Summary of Net Sales Transferred to Customers at a Point in Time and Over Time (Detail) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2026	Apr. 30, 2025
Disaggregation of Revenue [Line Items]
Net sales transferred to customers	$ 281,999	$ 240,472
Over Time
Disaggregation of Revenue [Line Items]
Net sales transferred to customers	196,966	193,797
Point in Time
Disaggregation of Revenue [Line Items]
Net sales transferred to customers	85,033	46,675
LPG
Disaggregation of Revenue [Line Items]
Net sales transferred to customers	214,886	179,398
LPG | Over Time
Disaggregation of Revenue [Line Items]
Net sales transferred to customers	129,853	132,723
LPG | Point in Time
Disaggregation of Revenue [Line Items]
Net sales transferred to customers	85,033	46,675
International
Disaggregation of Revenue [Line Items]
Net sales transferred to customers	67,113	61,074
International | Over Time
Disaggregation of Revenue [Line Items]
Net sales transferred to customers	67,113	61,074
International | Point in Time
Disaggregation of Revenue [Line Items]
Net sales transferred to customers	$ 0	$ 0

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