Stockholders' Equity (Tables)

12 Months Ended

Aug. 31, 2019

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, 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
Granted	2,779	$	101.05	13,922	$	83.65
Vested	(2,407)	$	91.05	(22,315)	$	41.35
Forfeited or cancelled	—			—
Unvested restricted stock at August 31, 2018	2,779	$	101.05	65,579	$	61.85
Granted	4,599	$	101.92	7,524	$	121.64
Vested	(2,779)	$	101.05	(25,443)	$	65.79
Forfeited or cancelled	—			(3,305)		79.39
Unvested restricted stock at August 31, 2019	4,599	$	101.92	44,355	$	67.18

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
$	16.00	7,597	3.1	$	16.00	$	640	7,597	$	16.00	$	640
$	29.72	13,790	4.0	$	29.72	$	972	13,790	$	29.72	$	972
$	35.50	13,372	5.0	$	35.50	$	865	13,372	$	35.50	$	865
$	39.50	12,753	6.0	$	39.50	$	774	12,753	$	39.50	$	774
$	64.37	34,887	7.0	$	64.37	$	1,251	34,887	$	64.37	$	1,251
$	93.50	9,163	8.0	$	93.50	$	62	5,954	$	93.50	$	40
$	99.38	483	9.0	$	99.38	$	—	161	$	99.38	$	—
$	104.00	606	8.5	$	104.00	$	—	404	$	104.00	$	—
$	123.95	8,603	9.0	$	123.95	$	—	2,865	$	123.95	$	—
		101,254	6.2	$	57.18	$	4,564	91,783	$	51.48	$	4,542

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

	Officers and Employees	Weighted Average Exercise Price
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
Granted	10,228	$	94.12
Exercised	(64,012)	$	19.06
Forfeited or cancelled	—
Options outstanding at August 31, 2018	99,190	$	57.18
Granted	9,086	$	122.64
Exercised	(7,022)	$	42.86
Forfeited or cancelled	—
Options outstanding at August 31, 2019	101,254	$	57.18
Options exercisable at August 31, 2019	91,783	$	51.48