Consolidated Statements of Income - Unaudited - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Feb. 28, 2026	Feb. 28, 2025	Feb. 28, 2026	Feb. 28, 2025
Income Statement [Abstract]
Revenues	$ 611,019	$ 570,660	$ 1,218,640	$ 1,139,327
Operating expenses
Cost of services	296,742	269,604	584,658	528,383
Selling, general and administrative	129,316	115,564	256,950	234,117
Total operating expenses	426,058	385,168	841,608	762,500
Operating income	184,961	185,492	377,032	376,827
Other income (expense), net
Interest income	891	273	1,980	2,974
Interest expense	(13,062)	(13,916)	(26,447)	(28,316)
Other income (expense), net	(11,679)	471	(1,341)	574
Total other income (expense), net	(23,850)	(13,172)	(25,808)	(24,768)
Income before income taxes	161,111	172,320	351,224	352,059
Provision for income taxes	28,055	27,460	65,588	57,177
Net income	$ 133,056	$ 144,860	$ 285,636	$ 294,882
Basic earnings per common share (in USD per share)	$ 3.60	$ 3.81	$ 7.68	$ 7.76
Diluted earnings per common share (in USD per share)	$ 3.59	$ 3.76	$ 7.65	$ 7.66
Basic weighted average common shares (in shares)	36,927	38,015	37,168	38,010
Diluted weighted average common shares (in shares)	37,063	38,510	37,339	38,513