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Warranties (Schedule Of Product Warranty Liability) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Feb. 28, 2015	Feb. 28, 2014	Feb. 28, 2015	Feb. 28, 2014
Warranties [Abstract]
Product warranty accrual balance, beginning of period	$ 9,174us-gaap_ProductWarrantyAccrual	$ 8,622us-gaap_ProductWarrantyAccrual	$ 9,331us-gaap_ProductWarrantyAccrual	$ 6,695us-gaap_ProductWarrantyAccrual
Liabilities accrued for warranties during the period	361us-gaap_ProductWarrantyAccrualWarrantiesIssued	703us-gaap_ProductWarrantyAccrualWarrantiesIssued	1,344us-gaap_ProductWarrantyAccrualWarrantiesIssued	3,745us-gaap_ProductWarrantyAccrualWarrantiesIssued
Warranty claims paid during the period	(1,068)us-gaap_ProductWarrantyAccrualPayments	(908)us-gaap_ProductWarrantyAccrualPayments	(2,208)us-gaap_ProductWarrantyAccrualPayments	(2,023)us-gaap_ProductWarrantyAccrualPayments
Product warranty accrual balance, end of period	$ 8,467us-gaap_ProductWarrantyAccrual	$ 8,417us-gaap_ProductWarrantyAccrual	$ 8,467us-gaap_ProductWarrantyAccrual	$ 8,417us-gaap_ProductWarrantyAccrual

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- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.15(5))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 15

-Subparagraph 5

-Article 9



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 8

-Subparagraph ((c)(5))

-URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249

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- Definition

Represents the aggregate decrease in the liability related to payments to satisfy claims for standard and extended product warranties.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 8

-Subparagraph ((c)(2))

-URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249

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- Definition

Represents the aggregate increase in the liability for accruals related to standard and extended product warranties issued during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 8

-Subparagraph ((c)(3))

-URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249

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