Share-based Awards - Summary of Share-Based Awards Granted During Period (Detail) - $ / shares		3 Months Ended
		May 31, 2019		May 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares and Shares Underlying Awards (in shares)		885,436		906,683
Weighted Average Per Share Award Fair Value (in dollars per share)		$ 183.37		$ 161.32
Service-based shares and share units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares and Shares Underlying Awards (in shares)	[2]	885,436	[1]	669,450
Weighted Average Per Share Award Fair Value (in dollars per share)		$ 183.37		$ 160.53
Vesting right description				Service-based share units granted during the three months ended May 31, 2018 vest over a four-year period with one-quarter vesting annually over the four- year period.
Vesting percentage				25.00%
Vesting period				4 years
Performance share units—target
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares and Shares Underlying Awards (in shares)		0		173,014
Weighted Average Per Share Award Fair Value (in dollars per share)		$ 0		$ 163.56
Performance share awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares and Shares Underlying Awards (in shares)		0		64,219	[1]
Weighted Average Per Share Award Fair Value (in dollars per share)		$ 0		$ 163.56
Vesting percentage				25.00%
Vesting period				3 years
Share-based Compensation Award, Tranche One | Service-based shares and share units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares and Shares Underlying Awards (in shares)		639,439
Vesting right description		vest over a three-year period with one-third vesting on the first anniversary of the grant date and one-twelfth vesting quarterly over the remaining two years
Percentage vested after one year of the grant date		33.00%
Vesting period		3 years
Share-based Compensation Award, Tranche Two | Service-based shares and share units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares and Shares Underlying Awards (in shares)		56,487
Vesting right description		vest over a three-year period with one-third vesting annually over the three-year period.
Vesting percentage		33.00%
Vesting period		3 years
Share-based Compensation Award, Tranche Three | Performance share awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares and Shares Underlying Awards (in shares)		189,510
Vesting percentage		33.00%
Vesting period		3 years

[1] Service-based shares and share units granted during the three months ended May 31, 2019 include 189,510 restricted stock awards that vest over a three-year period with one-third vesting annually over the three-year period. Restricted stock awards granted during the three months ended May 31, 2018 were subject to the achievement of a specified dollar amount of revenue for fiscal 2019 (the “RSA Performance Goal”). Since the Company achieved the RSA Performance Goal, 25% of the restricted stock vests on or about July 16, 2019, and the remainder vests ratably on a quarterly basis over the course of the subsequent three-year period, provided that the grantee’s business relationship with the Company has not ceased.

[2] Service-based shares and share units granted during the three months ended May 31, 2019 include 639,439 share units that vest over a three-year period with one-third vesting on the first anniversary of the grant date and one-twelfth vesting quarterly over the remaining two years and 56,487 share units that vest over a three-year period with one-third vesting annually over the three-year period. Service-based share units granted during the three months ended May 31, 2018 vest over a four-year period with one-quarter vesting annually over the four- year period.