Income Taxes (Details) $ in Thousands	3 Months Ended
Apr. 01, 2018 USD ($)
Income Taxes Tax Cuts And Jobs Act [Abstract]
Increase to Provisional tax expense, net	$ 47,800

Tax Cuts And Jobs Act Of 2017, provisional net income tax expense (benefit), increase

No definition available.

Name:	has_TaxCutsCndJobsActOf2017ProvisionalIncomeTaxExpenseBenefitIncrease
Namespace Prefix:	has_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration