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Stock-Based Compensation (Tables)
 12 Months Ended
Jul. 31, 2020
Share-based Payment Arrangement [Abstract]  
Summary of stock-based awards outstanding by award type
As of July 31, 2020, the following stock-based awards, by award type, were outstanding:
 July 31, 2020
Stock options1,422,025 
Performance shares206,482 
RSUs and restricted stock450,407 
Share units342,685 
Total2,421,599 
Stock-based compensation for awards detailing where recorded in Consolidated Statement of Operations
Stock-based compensation for awards issued is reflected in the following line items in our Consolidated Statements of Operations:
 Fiscal Years Ended July 31,
 202020192018
Cost of sales$823,000 1,047,000 758,000 
Selling, general and administrative expenses7,527,000 9,336,000 6,866,000 
Research and development expenses925,000 1,044,000 945,000 
Stock-based compensation expense before income tax benefit
9,275,000 11,427,000 8,569,000 
Estimated income tax benefit(2,042,000)(2,553,000)(2,005,000)
Net stock-based compensation expense$7,233,000 8,874,000 6,564,000 
Summary of stock-based compensation expense by award type Stock-based compensation expense (benefit), by award type, is summarized as follows:
Fiscal Years Ended July 31,
202020192018
Stock options$442,000 739,000 1,089,000 
Performance shares1,491,000 1,554,000 1,013,000 
RSUs and restricted stock2,543,000 2,149,000 1,458,000 
ESPP222,000 215,000 205,000 
Share units4,577,000 6,770,000 4,804,000 
Stock-based compensation expense before income tax benefit
9,275,000 11,427,000 8,569,000 
Estimated income tax benefit(2,042,000)(2,553,000)(2,005,000)
Net stock-based compensation expense$7,233,000 8,874,000 6,564,000 
Summary of the Plan's activity relating to stock options
The following table summarizes the Plan's activity:
 Awards
(in Shares)		Weighted Average
Exercise Price		Weighted Average
Remaining Contractual
Term (Years)		Aggregate
Intrinsic Value
Outstanding at July 31, 20171,855,875 $28.60   
Expired/canceled(72,190)27.58   
Exercised(114,710)27.44   
Outstanding at July 31, 20181,668,975 28.72   
Expired/canceled(32,490)30.11   
Exercised(80,930)28.18 
Outstanding at July 31, 20191,555,555 28.72 
Granted327,100 17.88 
Expired/canceled(174,840)29.06 
Exercised(285,790)28.82 
Outstanding at July 31, 20201,422,025 $26.17 4.51$— 
Exercisable at July 31, 20201,036,435 $28.73 2.80$— 
Vested and expected to vest at July 31, 20201,404,387 $26.25 4.46$— 
Summary of the Plan's activity relating to performance shares, RSUs, restricted stock and share units
The following table summarizes the Plan's activity relating to performance shares, RSUs, restricted stock and share units:
  Awards
(in Shares)		 Weighted Average
Grant Date
Fair Value		 
Aggregate
Intrinsic Value
Outstanding at July 31, 2017 830,197 $16.95 
Granted 473,005 22.45 
Settled (354,822)17.66 
Canceled/Forfeited (129,942)17.26 
Outstanding at July 31, 2018 818,438 19.78 
Granted 442,363 29.76 
Settled (275,619)26.05 
Canceled/Forfeited (30,506)25.52 
Outstanding at July 31, 2019954,676 22.40 
Granted560,361 19.93 
Settled(431,581)22.02 
Canceled/Forfeited(83,882)22.84 
Outstanding at July 31, 2020 999,574 $21.15 $16,413,000 
  
Vested at July 31, 2020 429,191 $16.22 $7,047,000 
  
Vested and expected to vest at July 31, 2020 964,807 $21.10 $15,842,000