Treasury Stock - Additional Information (Details) - USD ($)		6 Months Ended		17 Months Ended
	Aug. 29, 2017	Jul. 31, 2019	Jul. 31, 2018	Aug. 29, 2017	Mar. 31, 2016
Equity Class Of Treasury Stock [Line Items]
Stock repurchase program, total cost of shares repurchased		$ 4,199,000	$ 2,057,000
Existing Share Repurchase Program
Equity Class Of Treasury Stock [Line Items]
Stock repurchase program, number of shares authorized	$ 50,000,000.0			$ 50,000,000.0
Stock repurchase program, total cost of shares repurchased		$ 4,200,000	$ 2,100,000
Stock repurchase program expiration date	Aug. 29, 2020
Stock repurchase program, number of shares repurchased		131,402	52,400
Stock repurchase program, average per share price of shares repurchased		$ 31.96	$ 39.25
Stock repurchase program, remaining authorized repurchase amount		$ 36,400,000
Previously Authorized Repurchase Plan
Equity Class Of Treasury Stock [Line Items]
Stock repurchase program, number of shares authorized					$ 50,000,000.0
Stock repurchase program, total cost of shares repurchased				$ 5,500,000
Surrender of Shares by Employee
Equity Class Of Treasury Stock [Line Items]
Stock repurchase program, number of shares repurchased		42,127	17,979