Leases (Schedule Of Future Minimum Rental Payments) (Details) - USD ($) $ in Thousands	Aug. 31, 2017	Aug. 31, 2016	Aug. 31, 2015
Operating
Operating, 2018	$ 8,785
Operating, 2019	8,703
Operating, 2020	8,700
Operating, 2021	8,056
Operating, 2022	7,244
Operating, Thereafter	51,856
Operating, Total minimum lease payments	93,344
Capital
Capital, 2018	4,706
Capital, 2019	3,699
Capital, 2020	3,267
Capital, 2021	3,186
Capital, 2022	2,678
Capital, Thereafter	7,072
Capital, Total minimum lease payments	24,608
Less amount representing interest averaging 5.5%	(4,977)
Present value of net minimum lease payments	19,631
Less amount due within one year	(3,464)
Amount due after one year	16,167	$ 17,391
Debt Instrument [Line Items]
Minimum operating rentals receivable under noncancelable subleases	7,600
Contingent rentals for capital leases	$ 300	$ 900	$ 1,000
Capital Lease Obligations [Member]
Debt Instrument [Line Items]
Average interest rate	5.50%