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Future Minimum Lease Commitments (Details)
$ in Thousands
204 Months Ended
Aug. 31, 2035
yr
Sep. 30, 2017
USD ($)
Commitments and Contingencies Disclosure [Abstract]    
Lessee leasing arrangements, operating leases, terms of contract | yr 17  
Operating Leases, Future Minimum Payments, Remainder of Fiscal Year   $ 61,817
2018   221,493
2019   179,078
2020   143,199
2021   108,044
2022   85,547
Thereafter   539,398
Future Minimum Lease Payments   $ 1,338,576
Number of consecutive lease renewals 3  
Length of each renewal 5  
Annual rent percentage increase 1.50%