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Guarantor Subsidiaries And Non-Guarantor Subsidiaries (Supplemental Condensed Consolidating Statement Of Cash Flows) (Details) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Apr. 30, 2012
Apr. 30, 2011
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by operating activities $ 234,045 $ 291,345
Capital expenditures (107,999) (73,569)
Acquisition of businesses (23,479) (60,528)
Other investing activities, net (944) (365)
Net cash (used in) provided by investing activities (132,422) (134,462)
Proceeds from borrowings under other long-term debt 56,000 189,000
Payments of other long-term debt (57,002) (226,705)
Proceeds from borrowings under long-term debt   390,000
Payment of long-term debt   (346,063)
Payment of financing costs (228) (8,123)
Repurchases of common stock (7,869)  
Dividends paid (17,559)  
Other financing activities, net 2,006 (1,141)
Net cash (used in) provided by financing activities (24,652) (3,032)
Effect of exchange rate changes on cash and cash equivalents (4)  
Net increase in cash and cash equivalents 76,967 153,851
Beginning of period 70,143 14,745
End of period 147,110 168,596
Parent Company [Member]
    
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by operating activities 38,944 27,933
Proceeds from borrowings under long-term debt   390,000
Payment of long-term debt   (346,063)
Payment of financing costs (88) (8,123)
Repurchases of common stock (7,869)  
Dividends paid (17,559)  
Other financing activities, net 1,590 1,313
Advances (15,018) (65,060)
Net cash (used in) provided by financing activities (38,944) (27,933)
100% Owned Guarantor Subsidiaries [Member]
    
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by operating activities 193,371 262,213
Capital expenditures (107,779) (73,524)
Acquisition of businesses (24,311) (60,528)
Other investing activities, net (944) (365)
Net cash (used in) provided by investing activities (133,034) (134,417)
Proceeds from borrowings under other long-term debt 56,000 189,000
Payments of other long-term debt (56,805) (226,518)
Payment of financing costs (140)  
Other financing activities, net 226 (3,671)
Advances 15,018 65,060
Net cash (used in) provided by financing activities 14,299 23,871
Net increase in cash and cash equivalents 74,636 151,667
Beginning of period 63,365 11,315
End of period 138,001 162,982
Other Subsidiaries [Member]
    
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by operating activities 1,730 1,199
Capital expenditures (220) (45)
Acquisition of businesses 832  
Net cash (used in) provided by investing activities 612 (45)
Payments of other long-term debt (197) (187)
Other financing activities, net 190 1,217
Net cash (used in) provided by financing activities (7) 1,030
Effect of exchange rate changes on cash and cash equivalents (4)  
Net increase in cash and cash equivalents 2,331 2,184
Beginning of period 6,778 3,430
End of period $ 9,109 $ 5,614