Investments - Additional Information (Detail) |
6 Months Ended |
|---|---|
Sep. 30, 2018 | |
| Minimum [Member] | |
| Schedule of Held-to-maturity Securities [Line Items] | |
| Treasury with original maturities period | 3 months |
| Maximum [Member] | |
| Schedule of Held-to-maturity Securities [Line Items] | |
| Investment maturity date range end | May 02, 2019 |
| Treasury with original maturities period | 1 year |
| X | ||||||||||
- Definition Original maturity period for held to maturity securities. No definition available.
|
| X | ||||||||||
- Definition The maturity date of the investment. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition 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.
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|