Operating Segment Information (Details) - USD ($) $ in Thousands	12 Months Ended
	May 31, 2023	May 31, 2022	May 31, 2021
Disclosures related to operating segments
Revenue	$ 8,815,769	$ 7,854,459	$ 7,116,340
Gross margin	4,173,368	3,632,246	3,314,651
Selling and administrative expenses	2,370,704	2,044,876	1,929,159
Interest expense, net	109,516	88,602	97,743
Income before income taxes	1,693,148	1,498,768	1,287,749
Depreciation and amortization	409,162	399,701	387,951
Capital expenditures	331,109	240,672	143,470
Total assets	8,546,356	8,147,256	8,236,823
Uniform Rental and Facility Services
Disclosures related to operating segments
Revenue	6,897,130	6,226,980	5,689,632
First Aid and Safety Services
Disclosures related to operating segments
Revenue	951,496	832,458	784,291
Operating Segments | Uniform Rental and Facility Services
Disclosures related to operating segments
Revenue	6,897,130	6,226,980	5,689,632
Gross margin	3,264,955	2,910,547	2,706,118
Selling and administrative expenses	1,786,198	1,557,057	1,480,278
Interest expense, net	0	0	0
Income before income taxes	1,478,757	1,353,490	1,225,840
Depreciation and amortization	326,185	329,473	323,596
Capital expenditures	227,436	166,559	104,020
Total assets	7,176,257	6,979,731	6,743,272
Operating Segments | First Aid and Safety Services
Disclosures related to operating segments
Revenue	951,496	832,458	784,291
Gross margin	482,088	372,193	332,336
Selling and administrative expenses	301,398	265,430	251,153
Interest expense, net	0	0	0
Income before income taxes	180,690	106,763	81,183
Depreciation and amortization	62,059	48,656	43,314
Capital expenditures	76,549	59,656	34,384
Total assets	703,226	664,040	637,663
Operating Segments | All Other
Disclosures related to operating segments
Revenue	967,143	795,021	642,417
Gross margin	426,325	349,506	276,197
Selling and administrative expenses	283,108	222,389	197,728
Interest expense, net	0	0	0
Income before income taxes	143,217	127,117	78,469
Depreciation and amortization	20,918	21,572	21,041
Capital expenditures	27,124	14,457	5,066
Total assets	542,724	413,014	362,248
Corporate
Disclosures related to operating segments
Revenue	0	0	0
Gross margin	0	0	0
Selling and administrative expenses	0	0	0
Interest expense, net	109,516	88,602	97,743
Income before income taxes	(109,516)	(88,602)	(97,743)
Depreciation and amortization	0	0	0
Capital expenditures	0	0	0
Total assets	$ 124,149	$ 90,471	$ 493,640