Commitments And Contingencies Commitments And Contigencies (Minimum Lease Commitments Payable For Noncancelable Operating Leases) (Details) (USD $) In Thousands, unless otherwise specified	Aug. 31, 2012
Equipment [Member]
Property Subject to or Available for Operating Lease [Line Items]
2013	$ 13,973
2014	8,856
2015	5,660
2016	4,859
2017	3,536
Real Estate [Member]
Property Subject to or Available for Operating Lease [Line Items]
2013	22,012
2014	20,553
2015	20,072
2016	14,646
2017	$ 9,058

Amount of required minimum rental payments maturing in the next fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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Amount of required minimum rental payments maturing in the fifth fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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- Definition

Amount of required minimum rental payments maturing in the forth fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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- Definition

Amount of required minimum rental payments maturing in the third fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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- Definition

Amount of required minimum rental payments maturing in the second fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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