Summary Of Significant Accounting Policies (Narrative) (Details)	12 Months Ended
	Jul. 31, 2015 USD ($) item shares	Jul. 31, 2014 USD ($) shares	Jul. 31, 2013 USD ($) shares
Significant Accounting Policies [Line Items]
Number of manufacturing plants around world | item	41
Number of joint ventures | item	3
Foreign currency translation gains	$ 2,100,000	$ 1,700,000	$ 200,000
Number of days considered to review for collectability	90 days
Inventories valuation, LIFO method to total inventory, in percentage	34.20%	34.20%
Excess of FIFO inventory cost over LIFO inventory carrying values	$ 41,600,000	$ 37,900,000
Depreciation expense	66,900,000	62,000,000	58,800,000
Impairment charges	$ 0	$ 0	$ 0
Options excluded from the diluted net earnings per share calculation | shares	977,824	884,138	22,619
Shipping and handling costs	$ 63,200,000	$ 64,200,000	$ 66,200,000
Maximum [Member]
Significant Accounting Policies [Line Items]
Capitalization of direct cost, amortization period in years	7 years
Minimum [Member]
Significant Accounting Policies [Line Items]
Capitalization of direct cost, amortization period in years	5 years
Machinery And Equipment [Member] | Maximum [Member]
Significant Accounting Policies [Line Items]
Estimated useful life, years	10 years
Machinery And Equipment [Member] | Minimum [Member]
Significant Accounting Policies [Line Items]
Estimated useful life, years	3 years
Building And Building Improvements [Member] | Maximum [Member]
Significant Accounting Policies [Line Items]
Estimated useful life, years	40 years
Building And Building Improvements [Member] | Minimum [Member]
Significant Accounting Policies [Line Items]
Estimated useful life, years	10 years
Other Intangible Assets [Member] | Maximum [Member]
Significant Accounting Policies [Line Items]
Estimated useful life, years	20 years
Other Intangible Assets [Member] | Minimum [Member]
Significant Accounting Policies [Line Items]
Estimated useful life, years	3 years
Partially Completed Facility In Xuzhou China [Member]
Significant Accounting Policies [Line Items]
Impairment charges	$ 2,900,000	$ 0	$ 0