Goodwill and Other Assets - Additional Information (Detail) - USD ($)	3 Months Ended	12 Months Ended
	Feb. 28, 2025	May 31, 2025	May 31, 2024	May 31, 2023
Goodwill And Other Intangible Assets [Line Items]
Goodwill		$ 79,600,000	$ 79,600,000	$ 78,600,000
Amortization expense		6,000,000	6,300,000	$ 6,300,000
Net book value of indefinite-lived intangible assets		5,200,000	6,500,000
Number of plans				two
Assets held for sale		11,500,000	2,900,000
Impairment charge of long-lived assets	$ 0		1,400,000
Impairment of goodwill		0
Operating lease assets		72,600,000	72,900,000
Estimate of fair value less costs to sell			200,000
Disposal Group Held for Use
Goodwill And Other Intangible Assets [Line Items]
Impairment charge of long-lived assets		5,600,000
Carrying value long-lived assets		17,000,000
Disposal Group Held for Use | Machinery and Equipment and Other Long-lived Assets
Goodwill And Other Intangible Assets [Line Items]
Impairment charge of long-lived assets		3,800,000
Disposal Group Held for Use | Finance Lease Assets and Buildings and Improvements, Net
Goodwill And Other Intangible Assets [Line Items]
Impairment charge of long-lived assets		0
Disposal Group Assets Held For Sale
Goodwill And Other Intangible Assets [Line Items]
Assets held for sale		10,400,000
In Process Research and Development
Goodwill And Other Intangible Assets [Line Items]
Net book value of indefinite-lived intangible assets		1,300,000	$ 1,300,000
Pre-tax impairment charge		$ 1,300,000
Fixed Assets
Goodwill And Other Intangible Assets [Line Items]
Assets held for sale				$ 2,600,000
Impairment charge of long-lived assets				$ 2,100,000
Minimum
Goodwill And Other Intangible Assets [Line Items]
Definite-lived intangible assets, estimated useful lives		7 years
Maximum
Goodwill And Other Intangible Assets [Line Items]
Definite-lived intangible assets, estimated useful lives		20 years