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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, 2013
Oct. 31, 2012
Net cash (used in) provided by operating activities $ 29,293 $ 34,577
Capital expenditures (46,751) (35,907)
Other investing activities, net 100 255
Net cash used in investing activities (46,651) (35,652)
Dividends paid (7,489) (6,729)
Other financing activities, net 445 5,704
Advances 0 0
Net cash provided by (used in) financing activities (7,044) (1,025)
Effect of exchange rate changes on cash and cash equivalents 23 32
Net increase (decrease) in cash and cash equivalents (24,379) (2,068)
Beginning of period 138,604 46,053
End of period 114,225 43,985
Parent Company [Member]
    
Net cash (used in) provided by operating activities (44,375) (38,785)
Capital expenditures 0 0
Other investing activities, net 0 0
Net cash used in investing activities 0 0
Dividends paid (7,489) (6,729)
Other financing activities, net 2,969 3,628
Advances 48,895 41,886
Net cash provided by (used in) financing activities 44,375 38,785
Effect of exchange rate changes on cash and cash equivalents 0 0
Net increase (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 74,291 73,658
Capital expenditures (46,477) (35,654)
Other investing activities, net 93 255
Net cash used in investing activities (46,384) (35,399)
Dividends paid 0 0
Other financing activities, net (2,858) 2,170
Advances (48,895) (42,030)
Net cash provided by (used in) financing activities (51,753) (39,860)
Effect of exchange rate changes on cash and cash equivalents (71) 0
Net increase (decrease) in cash and cash equivalents (23,917) (1,601)
Beginning of period 130,970 38,380
End of period 107,053 36,779
Other Subsidiaries [Member]
    
Net cash (used in) provided by operating activities (623) (296)
Capital expenditures (274) (253)
Other investing activities, net 7 0
Net cash used in investing activities (267) (253)
Dividends paid 0 0
Other financing activities, net 334 (94)
Advances 0 144
Net cash provided by (used in) financing activities 334 50
Effect of exchange rate changes on cash and cash equivalents 94 32
Net increase (decrease) in cash and cash equivalents (462) (467)
Beginning of period 7,634 7,673
End of period $ 7,172 $ 7,206