Deferred Selling Costs (Detail) - USD ($)	3 Months Ended
	May 31, 2019	May 31, 2018	Feb. 28, 2019
Revenue from Contract with Customer [Abstract]
Deferred commissions, current	$ 183,462,000		$ 201,971,000
Deferred commissions, non-current	45,860,000		47,849,000
Total deferred commissions	229,322,000		$ 249,820,000
Amortization expense	64,300,000	$ 56,200,000
Impairment loss	$ 0	$ 0