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Leases - Schedule of Supplemental Balance Sheet Information Related to Leases (Detail)
$ in Thousands
Oct. 05, 2019
USD ($)
Operating leases:  
Operating lease assets $ 272,591
Current portion of operating lease liabilities 41,795
Noncurrent operating lease liabilities 273,631
Total operating lease liabilities 315,426
Finance leases:  
Property and equipment, at cost 63,000
Accumulated amortization (30,262)
Property and equipment, net $ 32,738
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] us-gaap:PropertyPlantAndEquipmentNet
Current portion of finance lease liabilities $ 5,135
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] sptn:LongTermDebtAndFinanceLeaseLiabilityCurrent
Noncurrent finance lease liabilities $ 32,422
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] sptn:LongTermDebtAndFinanceLeaseLiabilityNoncurrent
Total finance lease liabilities $ 37,557
Weighted average remaining lease term:  
Operating leases 9 years
Finance leases 10 years 2 months 12 days
Weighted average discount rate:  
Operating leases 5.70%
Finance leases 8.20%