Stockholders' Equity (Tables)

12 Months Ended

Aug. 31, 2017

Stockholders' Equity

Summary of restricted stock plan

	Non Employee Directors	Weighted Average Grant Date Fair Value		Officers and Employees	Weighted Average Grant Date Fair Value
Unvested restricted stock at August 31, 2014	4,878	$	29.52	56,079	$	18.83
Granted	5,361	$	36.19	36,610	$	37.76
Vested	(4,878)	$	29.52	(32,234)	$	16.68
Forfeited or cancelled	—			(12,186)	$	14.63
Unvested restricted stock at August 31, 2015	5,361	$	36.19	48,269	$	35.68
Granted	4,554	$	48.12	25,330	$	39.07
Vested	(5,361)	$	36.19	(18,271)	$	29.72
Forfeited or cancelled	—			—
Unvested restricted stock at August 31, 2016	4,554	$	48.12	55,328	$	39.20
Granted	2,407	$	91.05	42,160	$	60.67
Vested	(4,554)	$	48.12	(23,516)	$	38.81
Forfeited or cancelled	—			—
Unvested restricted stock at August 31, 2017	2,407	$	91.05	73,972	$	51.56

Summary of information about stock options outstanding

		Options Outstanding						Options Exercisable
Exercise Prices		Number Outstanding	Weighted Avg. Remaining Contractual Life	Weighted Average Exercise Price		Aggregate Intrinsic Value		Number Exercisable	Weighted Average Exercise Price		Aggregate Intrinsic Value
$	12.70	15,105	3.0	$	12.70	$	1,220	15,105	$	12.70	$	1,220
$	12.77	16,953	4.0	$	12.77	$	1,369	16,953	$	12.77	$	1,369
$	16.00	25,087	5.1	$	16.00	$	1,944	25,087	$	16.00	$	1,944
$	16.53	3,926	3.7	$	16.53	$	302	3,926	$	16.53	$	302
$	29.72	16,246	6.0	$	29.72	$	1,036	16,246	$	29.72	$	1,036
$	35.50	17,965	7.0	$	35.50	$	1,042	17,965	$	35.50	$	1,042
$	39.50	19,101	8.0	$	39.50	$	1,032	13,264	$	39.50	$	716
$	64.37	38,591	9.0	$	64.37	$	1,124	6,641	$	64.37	$	194
		152,974	6.4	$	34.21	$	9,069	115,187	$	25.58	$	7,823

Summary of the transactions of the Company's stock option plans

	Officers and Employees	Weighted Average Exercise Price
Options outstanding at August 31, 2014	463,901	$	15.43
Granted	22,750	$	35.50
Exercised	(169,038)	$	15.21
Forfeited or cancelled	(4,224)	$	22.25
Options outstanding at August 31, 2015	313,389	$	16.92
Granted	21,275	$	39.50
Exercised	(140,113)	$	15.27
Forfeited or cancelled	—
Options outstanding at August 31, 2016	194,551	$	20.57
Granted	38,591	$	64.37
Exercised	(80,168)	$	15.62
Forfeited or cancelled	—
Options outstanding at August 31, 2017	152,974	$	34.21
Options exercisable at August 31, 2017	115,187	$	25.58