Note 13 - Employee Stock Option and Retirement Plans (Tables)

9 Months Ended

May 31, 2019

Notes Tables

Share-based Payment Arrangement, Option and Stock Appreciation Rights, Activity [Table Text Block]

(in thousands, except per share data)	Number of Stock Options Outstanding			Weighted Average Exercise Price Per Share
Balance at August 31, 2018		3,143		$	153.05
Granted – non-performance-based employee grant		455			221.93
Exercised		(117	)		132.81
Forfeited		(24	)		169.47
Balance at November 30, 2018		3,457		$	162.68
Granted – non-performance-based employee grant		6			207.84
Granted – non-employee Directors’ grant		21			207.88
Exercised		(207	)		136.30
Forfeited		(61	)		152.19
Balance at February 28, 2019		3,216		$	164.42
Granted – non-performance-based employee grant		2			267.02
Exercised		(279	)		137.82
Forfeited		(73	)		168.42
Balance at May 31, 2019		2,866		$	167.00

Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block]

(in thousands, except per award data)	Number Outstanding			Weighted Average Grant Date Fair Value Per Award
Balance at August 31, 2018		143		$	139.34
Granted		41		$	212.66
Forfeited		(1	)	$	200.18
Vested		(52	)  (1)	$	113.44
Balance at November 30, 2018		131		$	172.48
Granted		—		$	—
Forfeited		(1	)	$	184.64
Vested		(23	)  (2)	$	136.58
Balance at February 28, 2019		107		$	187.62
Granted		—		$	—
Forfeited		(3	)	$	177.29
Vested		—		$	—
Balance at May 31, 2019		104		$	180.09

Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]

(in thousands)	Share-based Awards Available for Grant under the Employee Stock Option Plan			Share-based Awards Available for Grant under the Non-Employee Stock Option Plan
Balance at August 31, 2018		6,298			282
Granted – non-performance-based options		(455	)		—
Restricted stock awards granted (1)		(103	)		—
Share-based awards canceled/forfeited (2)		25			—
Balance at November 30, 2018		5,765			282
Granted – non-performance-based options		(6	)		(21	)
Share-based awards canceled/forfeited (2)		65			3
Balance at February 28, 2019		5,824			264
Granted – non-performance-based options		(2	)		—
Restricted stock awards granted (1)		(1	)		—
Share-based awards canceled/forfeited (2)		80			—
Balance at May 31, 2019		5,901			264