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Shareholders' Equity - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2019	Jul. 31, 2018	Jun. 04, 2019	Aug. 22, 2017
Equity, Class of Treasury Stock [Line Items]
Common shares authorized for repurchase, shares					20,000,000	20,000,000
Remaining common shares authorized for repurchase, shares	26,333,957		26,333,957
Stock repurchased and retired during period, total cost	$ (146,225)	$ (877)	$ (222,850)	$ (5,924)
Employee Stock
Equity, Class of Treasury Stock [Line Items]
Stock repurchased and retired during period, common shares			178,064	158,018
Stock repurchased and retired during period, total cost			$ 5,429	$ 5,924

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The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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Number of shares that have been repurchased and retired during the period.

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Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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