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Stockholders' Equity (Tables)
 6 Months Ended
Feb. 28, 2021
Share-based Payment Arrangement [Abstract]  
Schedule of Recognized Stock-based Compensation Expense
The Company recognized stock-based compensation expense within selling, general and administrative expense as follows (in thousands):
  Three months ended Six months ended
  February 28, 2021 February 29, 2020 February 28, 2021 February 29, 2020
Restricted stock units
 $ 20,324  $ 12,301  $ 51,597  $ 40,484 
Employee stock purchase plan 3,489  2,808  5,757  4,848 
Total $ 23,813  $ 15,109  $ 57,354  $ 45,332 
Schedule of Share-based Compensation Information
The following represents the stock-based compensation information as of the period indicated (in thousands):
  February 28, 2021
Unrecognized stock-based compensation expense—restricted stock units $ 58,206 
Remaining weighted-average period for restricted stock units expense 1.5 years
Schedule of Common Stock Outstanding
The following represents the common stock outstanding for the periods indicated:
Three months ended Six months ended
February 28, 2021 February 29, 2020 February 28, 2021 February 29, 2020
Common stock outstanding:
Beginning balances
 150,471,570  152,300,356  150,330,358  153,520,380 
Shares issued upon exercise of stock options
 —  43,069  —  56,999 
Shares issued under employee stock purchase plan
 771,548  595,717  771,548  595,717 
Vesting of restricted stock
 24,054  322,872  2,241,136  2,239,612 
Purchases of treasury stock under employee stock plans
 (8,873) (86,706) (610,279) (617,123)
Treasury shares purchased(1)
 (1,891,798) (1,767,782) (3,366,262) (4,388,059)
Ending balances
 149,366,501  151,407,526  149,366,501  151,407,526 
(1)In September 2019, the Company’s Board of Directors authorized the repurchase of up to $600.0 million of the Company’s common stock as part of a two-year capital allocation framework (the “2020 Share Repurchase Program”). As of February 28, 2021, 9.4 million shares had been repurchased for $345.9 million and $254.1 million remains available under the 2020 Share Repurchase Program. The 2020 Share Repurchase Program authorization expires at the end of fiscal year 2021.