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Guarantor Subsidiaries And Non-Guarantor Subsidiaries (Supplemental Condensed Consolidating Statement Of Cash Flows) (Details) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jan. 31, 2012
Jan. 31, 2011
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities $ 137,389 $ 243,705
Capital expenditures (93,186) (61,887)
Acquisition of business 342 (60,528)
Other investing activities, net (904) (256)
Net cash used in investing activities (93,748) (122,671)
Proceeds from borrowings under long-term debt 56,000 189,000
Payments of long-term debt (56,383) (226,067)
Repurchases of common stock (7,869)  
Dividends paid (10,801)  
Other financing activities, net 911 (1,461)
Net cash used in financing activities (18,142) (38,528)
Net increase in cash and cash equivalents 25,499 82,506
Beginning of period 70,143 14,745
End of period 95,642 97,251
Parent Company [Member]
    
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities (15,584) 35,263
Repurchases of common stock (7,869)  
Dividends paid (10,801)  
Other financing activities, net 912 687
Advances 33,342 (35,950)
Net cash used in financing activities 15,584 (35,263)
100% Owned Guarantor Subsidiaries [Member]
    
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities 152,379 209,360
Capital expenditures (93,117) (61,873)
Acquisition of business 342 (60,528)
Other investing activities, net (904) (256)
Net cash used in investing activities (93,679) (122,657)
Proceeds from borrowings under long-term debt 56,000 189,000
Payments of long-term debt (56,186) (225,880)
Other financing activities, net (373) (4,120)
Advances (33,342) 35,950
Net cash used in financing activities (33,901) (5,050)
Net increase in cash and cash equivalents 24,799 81,653
Beginning of period 63,365 11,315
End of period 88,164 92,968
Other Subsidiaries [Member]
    
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities 594 (918)
Capital expenditures (69) (14)
Net cash used in investing activities (69) (14)
Payments of long-term debt (197) (187)
Other financing activities, net 372 1,972
Net cash used in financing activities 175 1,785
Net increase in cash and cash equivalents 700 853
Beginning of period 6,778 3,430
End of period $ 7,478 $ 4,283