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Guarantor Subsidiaries And Non-Guarantor Subsidiaries (Supplemental Condensed Consolidating Statement Of Cash Flows) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Oct. 31, 2012
Oct. 31, 2011
Net cash (used in) provided by operating activities $ 34,577 $ 38,335
Capital expenditures (35,907) (51,003)
Other investing activities, net 255 (136)
Net cash used in investing activities (35,652) (51,139)
Repurchases of common stock 0 (7,869)
Dividends paid (6,729) (5,429)
Other financing activities, net 5,704 697
Advances 0 0
Net cash provided by (used in) financing activities (1,025) (12,601)
Effect of exchange rate changes on cash and cash equivalents 32 0
Net decrease in cash and cash equivalents (2,068) (25,405)
Beginning of period 46,053 70,143
End of period 43,985 44,738
Parent Company [Member]
    
Net cash (used in) provided by operating activities (38,785) (34,685)
Capital expenditures 0 0
Other investing activities, net 0 0
Net cash used in investing activities 0 0
Repurchases of common stock   (7,869)
Dividends paid (6,729) (5,429)
Other financing activities, net 3,628 994
Advances 41,886 46,989
Net cash provided by (used in) financing activities 38,785 34,685
Effect of exchange rate changes on cash and cash equivalents 0  
Net decrease in cash and cash equivalents 0 0
Beginning of period 0 0
End of period 0 0
100% Owned Guarantor Subsidiaries [Member]
    
Net cash (used in) provided by operating activities 73,658 73,005
Capital expenditures (35,654) (50,893)
Other investing activities, net 255 (136)
Net cash used in investing activities (35,399) (51,029)
Repurchases of common stock   0
Dividends paid 0 0
Other financing activities, net 2,170 (292)
Advances (42,030) (46,989)
Net cash provided by (used in) financing activities (39,860) (47,281)
Effect of exchange rate changes on cash and cash equivalents 0  
Net decrease in cash and cash equivalents (1,601) (25,305)
Beginning of period 38,380 63,365
End of period 36,779 38,060
Other Subsidiaries [Member]
    
Net cash (used in) provided by operating activities (296) 15
Capital expenditures (253) (110)
Other investing activities, net 0 0
Net cash used in investing activities (253) (110)
Repurchases of common stock   0
Dividends paid 0 0
Other financing activities, net (94) (5)
Advances 144 0
Net cash provided by (used in) financing activities 50 (5)
Effect of exchange rate changes on cash and cash equivalents 32  
Net decrease in cash and cash equivalents (467) (100)
Beginning of period 7,673 6,778
End of period $ 7,206 $ 6,678