Fair Value Measurements (Narrative) (Details)
Aug. 31, 2018
|Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]|
|Short-term investments maturity at acquisition||90 days|
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
No definition available.