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, 2013	Jan. 31, 2012
Net cash (used in) provided by operating activities	$ 171,277	$ 137,389
Capital expenditures	(53,920)	(93,186)
Acquisition of businesses	(19,958)	342
Other investing activities, net	246	(904)
Net cash used in investing activities	(73,632)	(93,748)
Proceeds from borrowings under long-term debt	96,000	56,000
Payments of other long-term debt	(96,444)	(56,383)
Repurchases of common stock	0	(7,869)
Dividends paid	(13,458)	(10,801)
Other financing activities, net	6,722	911
Advances	0	0
Net cash provided by (used in) financing activities	(7,180)	(18,142)
Effect of exchange rate changes on cash and cash equivalents	61	0
Net increase (decrease) in cash and cash equivalents	90,526	25,499
Beginning of period	46,053	70,143
End of period	136,579	95,642
Parent Company [Member]
Net cash (used in) provided by operating activities	(14,033)	(15,584)
Capital expenditures	0	0
Acquisition of businesses	0	0
Other investing activities, net	0	0
Net cash used in investing activities	0	0
Proceeds from borrowings under long-term debt	0	0
Payments of other long-term debt	0	0
Repurchases of common stock		(7,869)
Dividends paid	(13,458)	(10,801)
Other financing activities, net	3,934	912
Advances	23,557	33,342
Net cash provided by (used in) financing activities	14,033	15,584
Effect of exchange rate changes on cash and cash equivalents	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	185,445	152,379
Capital expenditures	(53,385)	(93,117)
Acquisition of businesses	(19,958)	342
Other investing activities, net	228	(904)
Net cash used in investing activities	(73,115)	(93,679)
Proceeds from borrowings under long-term debt	96,000	56,000
Payments of other long-term debt	(96,236)	(56,186)
Repurchases of common stock		0
Dividends paid	0	0
Other financing activities, net	2,585	(373)
Advances	(23,801)	(33,342)
Net cash provided by (used in) financing activities	(21,452)	(33,901)
Effect of exchange rate changes on cash and cash equivalents	0
Net increase (decrease) in cash and cash equivalents	90,878	24,799
Beginning of period	38,380	63,365
End of period	129,258	88,164
Other Subsidiaries [Member]
Net cash (used in) provided by operating activities	(135)	594
Capital expenditures	(535)	(69)
Acquisition of businesses	0	0
Other investing activities, net	18	0
Net cash used in investing activities	(517)	(69)
Proceeds from borrowings under long-term debt	0	0
Payments of other long-term debt	(208)	(197)
Repurchases of common stock		0
Dividends paid	0	0
Other financing activities, net	203	372
Advances	244	0
Net cash provided by (used in) financing activities	239	175
Effect of exchange rate changes on cash and cash equivalents	61
Net increase (decrease) in cash and cash equivalents	(352)	700
Beginning of period	7,673	6,778
End of period	$ 7,321	$ 7,478