Stock-based compensation plans - Summary of Unexercised Stock Acquisition Rights (Detail)
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12 Months Ended |
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Mar. 31, 2025
shares
¥ / shares
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Mar. 31, 2024
shares
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Mar. 31, 2023
shares
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Mar. 31, 2025
shares
$ / shares
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Mar. 31, 2022
shares
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| Disclosure of terms and conditions of share-based payment arrangement [line items] |
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| Exercise term |
exercisable up to 10 years from the date of grant.
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exercisable up to 10 years from the date of grant.
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exercisable up to 10 years from the date of grant.
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| Number of share options outstanding in share-based payment arrangement |
81,169,300
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97,809,500
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98,457,500
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81,169,300
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82,721,500
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| Series 26th date of options Granted on November20, 2013 [Member] |
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| Disclosure of terms and conditions of share-based payment arrangement [line items] |
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| Date of grant |
November 20, 2013
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| Exercise term |
November 20, 2014 to November 19, 2023
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| Exercise price | ¥ / shares |
¥ 402
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| Number of share options outstanding in share-based payment arrangement |
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72,000
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| Series 27th date of options Granted on November20, 2013 [Member] |
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| Disclosure of terms and conditions of share-based payment arrangement [line items] |
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| Date of grant |
November 20, 2013
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| Exercise term |
November 20, 2014 to November 19, 2023
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| Exercise price | $ / shares |
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$ 4.01
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| Number of share options outstanding in share-based payment arrangement |
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553,500
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| Series 28th date of options Granted on November20, 2014 [Member] |
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| Disclosure of terms and conditions of share-based payment arrangement [line items] |
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| Date of grant |
November 20, 2014
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| Exercise term |
November 20, 2015 to November 19, 2024
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| Exercise price | ¥ / shares |
¥ 483
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| Number of share options outstanding in share-based payment arrangement |
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417,500
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662,500
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| Series 29th date of options Granted on November20, 2014 [Member] |
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| Disclosure of terms and conditions of share-based payment arrangement [line items] |
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| Date of grant |
November 20, 2014
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| Exercise term |
November 20, 2015 to November 19, 2024
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| Exercise price | $ / shares |
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$ 4.14
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| Number of share options outstanding in share-based payment arrangement |
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613,500
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677,500
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| Series 30th date of options Granted on November19, 2015 [Member] |
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| Disclosure of terms and conditions of share-based payment arrangement [line items] |
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| Date of grant |
November 19, 2015
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| Exercise term |
November 19, 2016 to November 18, 2025
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| Exercise price | ¥ / shares |
¥ 681
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| Number of share options outstanding in share-based payment arrangement |
230,500
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445,000
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934,500
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230,500
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| Series 31st date of options Granted on November19, 2015 [Member] |
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| Disclosure of terms and conditions of share-based payment arrangement [line items] |
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| Date of grant |
November 19, 2015
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| Exercise term |
November 19, 2016 to November 18, 2025
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| Exercise price | $ / shares |
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$ 5.51
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| Number of share options outstanding in share-based payment arrangement |
337,000
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656,500
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741,000
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337,000
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| Series 32nd date of options Granted on November22, 2016 [Member] |
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| Disclosure of terms and conditions of share-based payment arrangement [line items] |
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| Date of grant |
November 22, 2016
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| Exercise term |
November 22, 2017 to November 21, 2026
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| Exercise price | ¥ / shares |
¥ 673
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| Number of share options outstanding in share-based payment arrangement |
755,500
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1,157,000
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1,952,000
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755,500
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| Series 33rd date of options Granted on November22, 2016 [Member] |
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| Disclosure of terms and conditions of share-based payment arrangement [line items] |
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| Date of grant |
November 22, 2016
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| Exercise term |
November 22, 2017 to November 21, 2026
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| Exercise price | $ / shares |
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$ 6.22
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| Number of share options outstanding in share-based payment arrangement |
983,000
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1,430,500
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1,652,500
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983,000
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| Series 34th date of options Granted on November21, 2017 [Member] |
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| Disclosure of terms and conditions of share-based payment arrangement [line items] |
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| Date of grant |
November 21, 2017
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| Exercise term |
November 21, 2018 to November 20, 2027
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| Exercise price | ¥ / shares |
¥ 1,047
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| Number of share options outstanding in share-based payment arrangement |
944,500
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1,401,000
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2,171,000
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944,500
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| Series 35th date of options Granted on November21, 2017 [Member] |
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| Disclosure of terms and conditions of share-based payment arrangement [line items] |
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| Date of grant |
November 21, 2017
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| Exercise term |
November 21, 2018 to November 20, 2027
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| Exercise price | $ / shares |
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$ 9.15
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| Number of share options outstanding in share-based payment arrangement |
1,486,500
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2,528,500
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3,102,500
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1,486,500
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| Series 36th date of options Granted on February28, 2018 [Member] |
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| Disclosure of terms and conditions of share-based payment arrangement [line items] |
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| Date of grant |
February 28, 2018
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| Exercise term |
February 28, 2019 to February 27, 2028
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| Exercise price | ¥ / shares |
¥ 1,089
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| Number of share options outstanding in share-based payment arrangement |
4,500
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7,500
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19,500
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4,500
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| Series 38th date of options Granted on November20, 2018 [Member] |
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| Disclosure of terms and conditions of share-based payment arrangement [line items] |
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| Date of grant |
November 20, 2018
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| Exercise term |
November 20, 2019 to November 19, 2028
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| Exercise price | ¥ / shares |
¥ 1,288
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| Number of share options outstanding in share-based payment arrangement |
2,308,500
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2,983,500
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4,199,500
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2,308,500
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| Series 39th date of options Granted on November20, 2018 [Member] |
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| Disclosure of terms and conditions of share-based payment arrangement [line items] |
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| Date of grant |
November 20, 2018
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| Exercise term |
November 20, 2019 to November 19, 2028
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| Exercise price | $ / shares |
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$ 11.25
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| Number of share options outstanding in share-based payment arrangement |
1,926,500
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3,271,500
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3,802,500
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1,926,500
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| Series 40th date of options Granted on November20, 2019 [Member] |
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| Disclosure of terms and conditions of share-based payment arrangement [line items] |
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| Date of grant |
November 20, 2019
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| Exercise term |
November 20, 2020 to November 19, 2029
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| Exercise price | ¥ / shares |
¥ 1,341
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| Number of share options outstanding in share-based payment arrangement |
2,799,000
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4,373,000
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6,050,500
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2,799,000
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| Series 41st date of options Granted on November20, 2019 [Member] |
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| Disclosure of terms and conditions of share-based payment arrangement [line items] |
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| Date of grant |
November 20, 2019
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| Exercise term |
November 20, 2020 to November 19, 2029
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| Exercise price | $ / shares |
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$ 12.2
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| Number of share options outstanding in share-based payment arrangement |
2,736,000
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4,582,000
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5,381,500
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2,736,000
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| Series 42nd date of options Granted on April17, 2020 [Member] |
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| Disclosure of terms and conditions of share-based payment arrangement [line items] |
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| Date of grant |
April 17, 2020
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| Exercise term |
April 17, 2021 to April 16, 2030
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| Exercise price | $ / shares |
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$ 12.75
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| Number of share options outstanding in share-based payment arrangement |
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66,500
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| Series 43rd date of options Granted on November18, 2020 [Member] |
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| Disclosure of terms and conditions of share-based payment arrangement [line items] |
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| Date of grant |
November 18, 2020
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| Exercise term |
November 18, 2021 to November 17, 2030
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| Exercise price | ¥ / shares |
¥ 1,848
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| Number of share options outstanding in share-based payment arrangement |
6,386,000
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8,270,000
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10,302,000
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6,386,000
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| Series 44th date of options Granted on November18, 2020 [Member] |
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| Disclosure of terms and conditions of share-based payment arrangement [line items] |
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| Date of grant |
November 18, 2020
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| Exercise term |
November 18, 2021 to November 17, 2030
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| Exercise price | $ / shares |
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$ 17.5
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| Number of share options outstanding in share-based payment arrangement |
5,641,000
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8,573,000
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9,310,500
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5,641,000
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| Series 45th date of options Granted on November 18 2021 [Member] |
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| Disclosure of terms and conditions of share-based payment arrangement [line items] |
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| Date of grant |
November 18, 2021
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| Exercise term |
November 18, 2022 to November 17, 2031
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| Exercise price | ¥ / shares |
¥ 2,870
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| Number of share options outstanding in share-based payment arrangement |
10,635,000
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11,656,000
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11,837,500
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10,635,000
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| Series 46th date of options Granted on November 18 2021 [Member] |
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| Disclosure of terms and conditions of share-based payment arrangement [line items] |
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| Date of grant |
November 18, 2021
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| Exercise term |
November 18, 2022 to November 17, 2031
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| Exercise price | $ / shares |
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$ 24.98
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| Number of share options outstanding in share-based payment arrangement |
10,119,500
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10,689,000
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11,385,500
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10,119,500
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| Series 47th date of options Granted on November 16 2022 [Member] |
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| Disclosure of terms and conditions of share-based payment arrangement [line items] |
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| Date of grant |
November 16, 2022
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| Exercise term |
November 16, 2023 to November 15, 2032
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| Exercise price | ¥ / shares |
¥ 2,278
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| Number of share options outstanding in share-based payment arrangement |
10,686,500
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12,006,000
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12,135,500
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10,686,500
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| Series 48th date of options Granted on November 16 2022 [Member] |
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| Disclosure of terms and conditions of share-based payment arrangement [line items] |
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| Date of grant |
November 16, 2022
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| Exercise term |
November 16, 2023 to November 15, 2032
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| Exercise price | $ / shares |
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$ 15.58
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| Number of share options outstanding in share-based payment arrangement |
7,836,500
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10,620,000
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11,447,500
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7,836,500
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| Series 49th date of options Granted on November 27 2023 [Member] |
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| Disclosure of terms and conditions of share-based payment arrangement [line items] |
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| Date of grant |
November 27, 2023
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| Exercise term |
November 27, 2024 to November 26, 2033
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| Exercise price | ¥ / shares |
¥ 2,589
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| Number of share options outstanding in share-based payment arrangement |
6,392,000
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6,471,000
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6,392,000
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| Series 50th date of options Granted on November 27 2023 [Member] |
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| Disclosure of terms and conditions of share-based payment arrangement [line items] |
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| Date of grant |
November 27, 2023
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| Exercise term |
November 27, 2024 to November 26, 2033
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| Exercise price | $ / shares |
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$ 17.1
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| Number of share options outstanding in share-based payment arrangement |
4,658,500
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5,657,500
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4,658,500
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| Series 51th Date Of Options Granted On November 25 2024 [Member] |
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| Disclosure of terms and conditions of share-based payment arrangement [line items] |
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| Date of grant |
November 25, 2024
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| Exercise term |
November 25, 2025 to November 24, 2034
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| Exercise price | ¥ / shares |
¥ 2,948
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| Number of share options outstanding in share-based payment arrangement |
2,867,000
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2,867,000
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| Series 52th Date Of Options Granted On November 27 2024 [Member] |
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| Disclosure of terms and conditions of share-based payment arrangement [line items] |
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| Date of grant |
November 25, 2024
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| Exercise term |
November 25, 2025 to November 24, 2034
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| Exercise price | $ / shares |
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$ 18.93
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| Number of share options outstanding in share-based payment arrangement |
1,435,800
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1,435,800
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