Income Taxes - Narrative (Details)	6 Months Ended
Feb. 28, 2026
Income Tax Disclosure [Abstract]
Effective tax rate difference	4.50%

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

No definition available.

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