Employee Benefit Plans (Fair Value Of Assets Held By International Pension Plans) (Details) (International Assets [Member], USD $) In Thousands	Jul. 31, 2011	Jul. 31, 2010	Jul. 31, 2009
Defined benefit plan, fair value of plan assets	$ 108,200	$ 87,200
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Defined benefit plan, fair value of plan assets	48,900	39,300
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Equity/Fixed Income [Member]
Defined benefit plan, fair value of plan assets	15,400	12,500
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Global Equity Securities [Member]
Defined benefit plan, fair value of plan assets	33,500	26,800
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Real Assets [Member]
Defined benefit plan, fair value of plan assets
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Fixed Income Securities [Member]
Defined benefit plan, fair value of plan assets
Significant Observable Inputs (Level 2) [Member]
Defined benefit plan, fair value of plan assets	33,000	26,200
Significant Observable Inputs (Level 2) [Member] | Equity/Fixed Income [Member]
Defined benefit plan, fair value of plan assets
Significant Observable Inputs (Level 2) [Member] | Global Equity Securities [Member]
Defined benefit plan, fair value of plan assets
Significant Observable Inputs (Level 2) [Member] | Real Assets [Member]
Defined benefit plan, fair value of plan assets	6,500	5,500
Significant Observable Inputs (Level 2) [Member] | Fixed Income Securities [Member]
Defined benefit plan, fair value of plan assets	26,500	20,700
Significant Unobservable Inputs (Level 3) [Member]
Defined benefit plan, fair value of plan assets	26,300	21,700
Significant Unobservable Inputs (Level 3) [Member] | Equity/Fixed Income [Member]
Defined benefit plan, fair value of plan assets	26,300	21,700	23,100
Significant Unobservable Inputs (Level 3) [Member] | Global Equity Securities [Member]
Defined benefit plan, fair value of plan assets
Significant Unobservable Inputs (Level 3) [Member] | Real Assets [Member]
Defined benefit plan, fair value of plan assets
Significant Unobservable Inputs (Level 3) [Member] | Fixed Income Securities [Member]
Defined benefit plan, fair value of plan assets
Equity/Fixed Income [Member]
Defined benefit plan, fair value of plan assets	41,700	34,200
Global Equity Securities [Member]
Defined benefit plan, fair value of plan assets	33,500	26,800
Real Assets [Member]
Defined benefit plan, fair value of plan assets	6,500	5,500
Fixed Income Securities [Member]
Defined benefit plan, fair value of plan assets	$ 26,500	$ 20,700