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Share Based Payments - Stock option Activity (Detail)
$ / shares in Units, $ in Thousands
12 Months Ended
Aug. 31, 2019
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding, Beginning balance, Number of Shares 1,706,866
Granted, Number of Shares 172,750
Exercised, Number of Shares (471,216)
Cancelled, Number of Shares (59,089)
Outstanding, Ending balance, Number of Shares 1,349,311
Exercisable, Number of Shares 793,266
Expected to vest, Number of Shares 500,441
Available for future grants, Number of Shares 547,519
Outstanding, Beginning balance, Weighted Average Exercise Price | $ / shares $ 534.74
Granted, Weighted Average Exercise Price | $ / shares 774.33
Exercised, Weighted Average Exercise Price | $ / shares 413.60
Cancelled, Weighted Average Exercise Price | $ / shares 679.92
Outstanding, Ending balance, Weighted Average Exercise Price | $ / shares 601.36
Exercisable, Weighted Average Exercise Price | $ / shares 528.85
Expected to vest, Weighted Average Exercise Price | $ / shares $ 704.81
Outstanding , Weighted-Average Remaining Contractual Term 6 years 29 days
Exercisable, Weighted-Average Remaining Contractual Term 4 years 10 months 17 days
Expected to vest, Weighted-Average Remaining Contractual Term 7 years 9 months 18 days
Outstanding, Aggregate Intrinsic Value | $ $ 675,097
Exercisable, Aggregate Intrinsic Value | $ 454,415
Expected to vest, Aggregate Intrinsic Value | $ $ 198,614