Leases - Summary of Lease Costs, Net of Immaterial Sublease Income (Details) $ in Thousands	12 Months Ended
	Sep. 30, 2020 USD ($)
Lessee Lease Description [Line Items]
Total lease costs	$ 238,014
Cost of Goods Sold and Selling, General and Administrative Expenses
Lessee Lease Description [Line Items]
Operating lease costs	192,484
Selling, General and Administrative Expenses
Lessee Lease Description [Line Items]
Amortization of leased assets	303
Variable lease costs	45,191
Interest Expense
Lessee Lease Description [Line Items]
Interest on lease liabilities	$ 36