Guarantor Subsidiaries And Non-Guarantor Subsidiaries (Supplemental Condensed Consolidating Statement Of Cash Flows) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Apr. 30, 2013	Apr. 30, 2012
Net cash (used in) provided by operating activities	$ 291,345	$ 234,045
Capital expenditures	(65,461)	(107,999)
Acquisition of businesses	(19,958)	(23,479)
Other investing activities, net	861	(944)
Net cash used in investing activities	(84,558)	(132,422)
Proceeds from borrowings under long-term debt	96,000	56,000
Payments of other long-term debt	(96,989)	(57,002)
Repurchases of common stock	0	(7,869)
Dividends paid	(20,905)	(17,559)
Other financing activities, net	6,778	1,778
Advances	0	0
Net cash provided by (used in) financing activities	(15,116)	(24,652)
Effect of exchange rate changes on cash and cash equivalents	11	(4)
Net increase (decrease) in cash and cash equivalents	191,682	76,967
Beginning of period	46,053	70,143
End of period	237,735	147,110
Parent Company [Member]
Net cash (used in) provided by operating activities	46,034	38,944
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	(20,905)	(17,559)
Other financing activities, net	3,986	1,502
Advances	(29,115)	(15,018)
Net cash provided by (used in) financing activities	(46,034)	(38,944)
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	244,970	193,371
Capital expenditures	(64,765)	(107,779)
Acquisition of businesses	(19,958)	(24,311)
Other investing activities, net	943	(944)
Net cash used in investing activities	(83,780)	(133,034)
Proceeds from borrowings under long-term debt	96,000	56,000
Payments of other long-term debt	(96,781)	(56,805)
Repurchases of common stock		0
Dividends paid	0	0
Other financing activities, net	2,608	86
Advances	29,065	15,018
Net cash provided by (used in) financing activities	30,892	14,299
Effect of exchange rate changes on cash and cash equivalents	(33)	0
Net increase (decrease) in cash and cash equivalents	192,049	74,636
Beginning of period	38,380	63,365
End of period	230,429	138,001
Other Subsidiaries [Member]
Net cash (used in) provided by operating activities	341	1,730
Capital expenditures	(696)	(220)
Acquisition of businesses	0	832
Other investing activities, net	(82)	0
Net cash used in investing activities	(778)	612
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	184	190
Advances	50	0
Net cash provided by (used in) financing activities	26	(7)
Effect of exchange rate changes on cash and cash equivalents	44	(4)
Net increase (decrease) in cash and cash equivalents	(367)	2,331
Beginning of period	7,673	6,778
End of period	$ 7,306	$ 9,109