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SHARE-BASED COMPENSATION PLANS (Tables)
 12 Months Ended
Sep. 30, 2020
Share-based Payment Arrangement [Abstract]  
Fair value assumptions and methodology
The fair value of our share-based awards, as shown below, was estimated using the Black-Scholes model with the following weighted-average assumptions:
Year Ended September 30,
202020192018
Weighted-average grant date fair value$39.68 $27.34 $26.59 
Expected term (in years)6.966.866.68
Expected volatility32 %26 %26 %
Risk-free rate of return1.6 %2.8 %2.4 %
Dividend yield1.3 %1.6 %1.0 %

A summary of stock option activity is as follows:
Stock
Options		Weighted
Average
Exercise
Price		Weighted
Average
Remaining
Contractual
Term
(in years)		Aggregate
Intrinsic
Value
(in thousands)
Outstanding at September 30, 2019879 $63.44 
Granted121 129.60 
Exercised(182)51.50 
Forfeited or canceled(11)75.59 
Outstanding at September 30, 2020807 $75.87 6.2$54,078 
Exercisable at September 30, 2020499 $58.27 5.1$42,184 
Expected to vest at September 30, 2020308 $104.39 8.1$11,836 

Year Ended September 30,
202020192018
Intrinsic value of options exercised$19,077 $20,711 $30,345 
Cash received from exercise of options9,350 13,193 19,247 
Tax benefit from exercise of options3,629 4,449 7,503 
Fair value of options vested3,765 4,506 5,008 
Year Ended September 30,
202020192018
Weighted-average grant date fair value$39.17 $25.16 $20.94 
Shares issued46 49 50 
Expected term (in years)0.50.50.5
Expected volatility52 %34 %26 %
Risk-free rate of return1.7 %2.3 %1.5 %
Dividend yield1.3 %1.6 %1.1 %
Summary of restricted stock awards and restricted stock unit awards
A summary of the activity of the restricted stock awards, RSU awards, and PSU awards is presented below:
Restricted Stock
Awards and Units		Weighted Average
Grant Date Fair
Value
Nonvested at September 30, 2019275 $87.36 
Granted 1
88 125.14 
Vested(100)74.65 
Forfeited(6)83.65 
Nonvested at September 30, 2020257 $104.83 
1 Includes PSUs awarded

Year Ended September 30,
202020192018
Weighted average grant date fair value$104.83 $87.36 $70.42 
Share based compensation expense
Total share-based compensation expense and the classification of that expense in the Consolidated Statements of Income for the years ended September 30, 2020, 2019 and 2018, is as follows:

Year Ended September 30,
202020192018
Cost of sales$2,863 $2,727 $2,450 
Research, development and technical2,090 2,150 1,940 
Selling, general and administrative11,443 13,350 14,128 
Tax benefit(3,162)(3,767)(4,306)
Total share-based compensation expense, net of tax$13,234 $14,460 $14,212 

Total gross share-based compensation expense is attributable to the following awards:
Year Ended September 30,
202020192018
Stock Options$4,406 $4,267 $6,392 
Restricted stock, restricted stock units, and replacement awards8,259 11,400 9,186 
Performance share units1,957 1,279 2,056 
ESPP1,774 1,281 885