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, 2014	Jan. 31, 2013
Net cash (used in) provided by operating activities	$ 174,621	$ 175,644
Capital expenditures	(93,771)	(58,287)
Acquisition of businesses	0	(19,958)
Other investing activities, net	149	246
Net cash used in investing activities	(93,622)	(77,999)
Proceeds from Issuance of Other Long-term Debt	0	96,000
Repayments of Long-term Debt	0	(96,444)
Dividends paid	(14,986)	(13,458)
Other financing activities, net	621	6,722
Advances	0	0
Net cash provided by (used in) financing activities	(14,365)	(7,180)
Effect of exchange rate changes on cash and cash equivalents	38	61
Net increase (decrease) in cash and cash equivalents	66,672	90,526
Beginning of period	138,604	46,053
End of period	205,276	136,579
Parent Company [Member]
Net cash (used in) provided by operating activities	(19,616)	(14,033)
Capital expenditures	0	0
Acquisition of businesses		0
Other investing activities, net	0	0
Net cash used in investing activities	0	0
Proceeds from Issuance of Other Long-term Debt		0
Repayments of Long-term Debt		0
Dividends paid	(14,986)	(13,458)
Other financing activities, net	3,390	3,934
Advances	31,212	23,557
Net cash provided by (used in) financing activities	19,616	14,033
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	193,841	189,812
Capital expenditures	(93,095)	(57,752)
Acquisition of businesses		(19,958)
Other investing activities, net	142	228
Net cash used in investing activities	(92,953)	(77,482)
Proceeds from Issuance of Other Long-term Debt		96,000
Repayments of Long-term Debt		(96,236)
Dividends paid	0	0
Other financing activities, net	(3,265)	2,585
Advances	(31,212)	(23,801)
Net cash provided by (used in) financing activities	(34,477)	(21,452)
Effect of exchange rate changes on cash and cash equivalents	(18)	0
Net increase (decrease) in cash and cash equivalents	66,393	90,878
Beginning of period	130,970	38,380
End of period	197,363	129,258
Other Subsidiaries [Member]
Net cash (used in) provided by operating activities	396	(135)
Capital expenditures	(676)	(535)
Acquisition of businesses		0
Other investing activities, net	7	18
Net cash used in investing activities	(669)	(517)
Proceeds from Issuance of Other Long-term Debt		0
Repayments of Long-term Debt		(208)
Dividends paid	0	0
Other financing activities, net	496	203
Advances	0	244
Net cash provided by (used in) financing activities	496	239
Effect of exchange rate changes on cash and cash equivalents	56	61
Net increase (decrease) in cash and cash equivalents	279	(352)
Beginning of period	7,634	7,673
End of period	$ 7,913	$ 7,321