Revenue Recognition - Schedule of Accounting Standard (Details) - USD ($) $ in Millions	12 Months Ended
Apr. 30, 2026	Apr. 30, 2025	Apr. 30, 2024
Capitalized Contract Cost [Line Items]
Topic 842	$ 8,645.0	$ 8,387.0	$ 8,061.0
Topic 606	2,509.0	2,404.0	2,798.0
Total	11,154.0	10,791.0	10,859.0
Total equipment rentals
Capitalized Contract Cost [Line Items]
Topic 842	8,645.0	8,387.0	8,061.0
Topic 606	1,675.0	1,593.0	1,569.0
Total	10,320.0	9,980.0	9,630.0
Equipment rentals
Capitalized Contract Cost [Line Items]
Topic 842	8,302.0	8,049.0	7,727.0
Total	8,302.0	8,049.0	7,727.0
Delivery and pick-up
Capitalized Contract Cost [Line Items]
Topic 606	875.0	862.0	802.0
Total	875.0	862.0	802.0
Other
Capitalized Contract Cost [Line Items]
Topic 842	343.0	338.0	334.0
Topic 606	800.0	731.0	767.0
Total	1,143.0	1,069.0	1,101.0
Sales of rental equipment
Capitalized Contract Cost [Line Items]
Topic 606	451.0	467.0	859.0
Total	451.0	467.0	859.0
Sales of new equipment, merchandise and consumables
Capitalized Contract Cost [Line Items]
Topic 606	383.0	344.0	370.0
Total	$ 383.0	$ 344.0	$ 370.0

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