Leases (Schedule Of Future Minimum Rental Payments) (Details) - USD ($) $ in Thousands	Aug. 31, 2018	Aug. 31, 2017	Aug. 31, 2016
Operating
Operating, 2019	$ 8,198
Operating, 2020	8,173
Operating, 2021	7,536
Operating, 2022	6,393
Operating, 2023	6,437
Operating, Thereafter	44,017
Operating, Total minimum lease payments	80,754
Capital
Capital, 2019	3,489
Capital, 2020	3,194
Capital, 2021	3,109
Capital, 2022	2,597
Capital, 2023	2,415
Capital, Thereafter	4,541
Capital, Total minimum lease payments	19,345
Less amount representing interest averaging 5.4%	(3,888)
Present value of net minimum lease payments	15,457
Less amount due within one year	(2,454)
Amount due after one year	13,003	$ 16,167
Debt Instrument [Line Items]
Minimum rentals receivable under noncancelable operating subleases	25,900
Minimum rentals receivable under noncancelable capital subleases	1,300
Contingent rentals for capital leases	$ 200	$ 300	$ 900
Capital Lease Obligations [Member]
Debt Instrument [Line Items]
Average interest rate	5.40%