Quarterly report pursuant to Section 13 or 15(d)

Investments - Additional Information (Detail)

v3.7.0.1
Investments - Additional Information (Detail) - USD ($)
$ in Thousands
Apr. 29, 2017
Jan. 28, 2017
Apr. 30, 2016
Investments Schedule [Abstract]      
Certificates of deposit $ 150,000 $ 30,000 $ 130,000