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Stock Plans (Tables)
 12 Months Ended
Aug. 31, 2020
Share-based Payment Arrangement [Abstract]  
Summary Of Restricted Stock and Performance Shares Activity
A summary of restricted stock units and performance shares activity during fiscal 2020 is as follows:
Number of
Shares		Weighted-Average Fair  Value at Grant Date (Per Share)
Outstanding on August 31, 20191,280,826 $23.87
Granted460,800 24.10
Forfeited(85,750)23.29
Vested(669,755)23.77
Outstanding on August 31, 2020986,121 $24.10
Summary Stock option Activity
A summary of stock option activity during fiscal 2020 is as follows:
SharesWeighted-Average
Exercise Price
(Per Share)		Weighted-Average
Remaining Contractual
Term		Aggregate
Intrinsic Value
Outstanding on September 1, 20191,606,543 $25.88 
Granted— — 
Exercised(145,113)19.77 
Forfeited— — 
Expired(6,389)35.68 
Outstanding on August 31, 20201,455,041 $26.45 3.5*
Exercisable on August 31, 20201,323,188 $26.55 3.3*
Summary of Weighted Average Grant-Date Fair Value Of options, Total Intrinsic Value of Options Exercised, and Cash Receipts from Options Exercised A summary of the total intrinsic value of options exercised and cash receipts from options exercised is summarized below (in thousands, except per share amounts):
 Year Ended August 31,
 202020192018
Intrinsic value of options exercised$803 $429 5,284 
Cash receipts from exercise of options2,631 1,404 15,140 
Weighted Average Assumptions As of August 31, 2020, there was $13.6 million of total unrecognized compensation cost related to share-based awards, including stock options, restricted stock, restricted stock units and performance shares, which will be recognized over a weighted average period of 1.8 years. The total fair value of share-based awards that vested during the fiscal years ended August 31, 2020 and 2019 was $18.2 million and $11.9 million, respectively.