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Employee Stock Plans - Additional Information (Detail) - $ / shares
shares in Millions
9 Months Ended
Aug. 06, 2020
May 09, 2019
Sep. 30, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Fair value of stock options granted $ 5.79    
Performance Shares [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Share-based compensation arrangement by share-based payment award, remaining contractual terms     3 years
Performance share units, vesting period     3 years
Achievement of an earnings per share target     70.00%
Achievement of total growth in revenue     30.00%
Performance Shares [Member] | Maximum [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Percentage of initial grant     200.00%
2019 Plan [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Maximum stock based compensation awards granted under the plan   3.1  
Stock awards expiry   2029