Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	9 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Oct. 01, 2019	Sep. 30, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201602Member	us-gaap:AccountingStandardsUpdate201409Member
Operating lease liabilities	$ 521,495		$ 562,100
Right-of-use assets	479,704		526,281
Net of tax cumulative adjustment to retained earnings	5,451,221			$ 4,235,491
Property and equipment, net	(1,455,008)			(1,770,516)
Long-term financing obligation	$ 0			$ (320,518)
Adoption of ASC
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net of tax cumulative adjustment to retained earnings			35,100
Cumulative adjustment to retained earnings, tax			9,600
Property and equipment, net			266,000
Long-term financing obligation			$ 324,800