Income Taxes - Narrative (Details)	9 Months Ended
May 31, 2025
Income Tax Disclosure [Abstract]
Effective tax rate difference	(0.80%)

Effective Income Tax Rate Reconciliation, Increase (Decrease) From Prior Year, Percent

No definition available.

Name:	atk_EffectiveIncomeTaxRateReconciliationIncreaseDecreaseFromPriorYearPercent
Namespace Prefix:	atk_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	duration