Stock based Compensation - Stock options outstanding and vested (Details)	6 Months Ended
	Feb. 29, 2020 $ / shares shares
Exercise Prices Two [Member] | Minimum [Member]
Exercise Prices	$ 40.01
Exercise Prices Two [Member] | Maximum [Member]
Exercise Prices	80.00
Exercise Prices Three [Member] | Minimum [Member]
Exercise Prices	80.01
Exercise Prices Three [Member] | Maximum [Member]
Exercise Prices	120.00
Exercise Prices Four [Member] | Minimum [Member]
Exercise Prices	120.01
Exercise Prices Four [Member] | Maximum [Member]
Exercise Prices	$ 160.00
Options Vested One [Member]
Number of options | shares	250
Weighted Average Remaining Contractual Life In Years	9 years 5 months 1 day
Weighted Average Exercise Price	$ 20.00
Options Vested Two [Member]
Number of options | shares	4,896
Weighted Average Remaining Contractual Life In Years	9 years 1 month 2 days
Weighted Average Exercise Price	$ 51.23
Options Vested Three [Member]
Number of options | shares	6,394
Weighted Average Remaining Contractual Life In Years	8 years 2 months 19 days
Weighted Average Exercise Price	$ 102.46
Options Vested Four [Member]
Number of options | shares	9,521
Weighted Average Remaining Contractual Life In Years	7 years 5 months 27 days
Weighted Average Exercise Price	$ 155.12
Options Vested Five [Member]
Number of options | shares	1,124
Weighted Average Remaining Contractual Life In Years	7 years 4 months 17 days
Weighted Average Exercise Price	$ 391.60
Options Vested [Member]
Number of options | shares	22,185
Weighted Average Remaining Contractual Life In Years	8 years 18 days
Weighted Average Exercise Price	$ 127.49
Options Outstanding and Exercisable One [Member]
Number of options | shares	5,375
Weighted Average Remaining Contractual Life In Years	9 years 3 months 7 days
Weighted Average Exercise Price	$ 24.35
Options Outstanding and Exercisable Two [Member]
Number of options | shares	13,729
Weighted Average Remaining Contractual Life In Years	9 years 1 month 2 days
Weighted Average Exercise Price	$ 51.21
Options Outstanding and Exercisable Three [Member]
Number of options | shares	10,553
Weighted Average Remaining Contractual Life In Years	8 years 2 months 19 days
Weighted Average Exercise Price	$ 102.93
Options Outstanding and Exercisable Four [Member]
Number of options | shares	12,625
Weighted Average Remaining Contractual Life In Years	7 years 6 months 18 days
Weighted Average Exercise Price	$ 155.28
Options Outstanding and Exercisable Five [Member]
Number of options | shares	1,124
Weighted Average Remaining Contractual Life In Years	7 years 4 months 17 days
Weighted Average Exercise Price	$ 391.60
Options Outstanding and Exercisable [Member]
Number of options | shares	43,406
Weighted Average Remaining Contractual Life In Years	8 years 4 months 28 days
Weighted Average Exercise Price	$ 99.55