Note 18 - Unaudited Quarterly Financial Data (Tables)

12 Months Ended

Aug. 31, 2013

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Information [Table Text Block]

Fiscal 2013	First Quarter		Second Quarter		Third Quarter		Fourth Quarter
Revenues	$	211,085	$	213,083	$	214,613	$	219,332
Cost of services		73,586		75,842		76,721		80,231
Selling, general and administrative		66,414		81,077		66,255		68,567
Operating income		71,085		56,164		71,637		70,534
Net income		49,769		44,539		53,367		50,964
Diluted earnings per common share	$	1.11	$	1.00	$	1.20	$	1.16
Weighted average common shares (diluted)		44,984		44,455		44,485		44,043

Fiscal 2012	First Quarter		Second Quarter		Third Quarter		Fourth Quarter
Revenues	$	196,448	$	199,371	$	202,311	$	207,663
Cost of services		66,833		67,531		68,878		72,295
Selling, general and administrative		62,862		64,723		64,939		64,741
Operating income		66,753		67,117		68,494		70,627
Net income		45,544		46,746		47,980		48,539
Diluted earnings per common share	$	0.99	$	1.02	$	1.05	$	1.08
Weighted average common shares (diluted)		46,103		45,707		45,736		45,152