Capital Stock - Additional Information (Detail) - USD ($)
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12 Months Ended |
68 Months Ended |
May 25, 2021 |
May 29, 2020 |
Mar. 16, 2020 |
May 29, 2019 |
Jun. 30, 2016 |
Jan. 31, 2022 |
Jan. 31, 2021 |
Jan. 31, 2020 |
Jan. 31, 2022 |
| Class Of Stock [Line Items] |
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| Preference shares, shares authorized |
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20,000,000
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20,000,000
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20,000,000
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| Preference shares, par value |
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$ 0.00045
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$ 0.00045
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$ 0.00045
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| Preference shares, shares issued |
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0
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0
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0
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| Preference shares, shares outstanding |
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0
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0
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0
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| Amount authorized under stock repurchase program |
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$ 275,000,000.0
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$ 275,000,000.0
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| Stock repurchase program, inception period |
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2016-06
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| Stock repurchased, shares |
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4,011,595
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| Stock repurchased during period, cash |
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0
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$ 1,000,000
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$ 0
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$ 175,800,000
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| Stock Repurchase Program $50.0 Million Authorization [Member] |
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| Class Of Stock [Line Items] |
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| Stock repurchase program, authorization date |
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May 29, 2019
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| Stock repurchase program, expiration date |
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Jun. 30, 2020
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| Stock repurchased, shares |
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25,719
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| Stock repurchased during period, cash |
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$ 1,000,000.0
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| Amount available under stock repurchase program |
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$ 49,000,000.0
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$ 49,000,000.0
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| Stock repurchase program, extended expiration period |
12 months
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12 months
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| Stock repurchase program, extended expiration date |
Jun. 30, 2022
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Jun. 30, 2021
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| Stock Repurchase Program $50.0 Million Authorization [Member] | Maximum [Member] |
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| Class Of Stock [Line Items] |
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| Amount authorized under stock repurchase program |
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$ 50,000,000.0
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