XML 78 R63.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Share-Based Compensation Plans - Summary of Activity Related to Stock Options Granted under University's Incentive Plan (Parenthetical) (Detail) | Dec. 31, 2017 $ / shares
--- | ---
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Value of closing stock price | $ 89.53

X
- References No definition available. + Details
Name: | us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Price of a single share of a number of saleable stocks of a company. + References No definition available. + Details
Name: | us-gaap_SharePrice
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant