Quarterly report pursuant to Section 13 or 15(d)

Investments - Additional Information (Detail)

v3.6.0.2
Investments - Additional Information (Detail)
9 Months Ended
Dec. 31, 2016
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 Sep. 14, 2017
Treasury with original maturities period 1 year