| Date Filed | Type | Description |
| 08/19/2022 |
10-K/A
| Annual Report for the period ended April 30, 2022 [amend] |
| 07/29/2022 |
10-K
| Annual Report for the period ended April 30, 2022 |
| 08/06/2021 |
10-K/A
| Annual Report for the period ended April 30, 2021 [amend] |
| 07/13/2021 |
10-K
| Annual Report for the period ended April 30, 2021 |
| 07/14/2020 |
10-K/A
| Annual Report for the period ended April 30, 2020 [amend] |
| 07/07/2020 |
10-K
| Annual Report for the period ended April 30, 2020 |
| 08/28/2019 |
10-K/A
| Annual Report for the period ended April 30, 2019 [amend] |
| 07/17/2019 |
10-K/A
| Annual Report for the period ended April 30, 2019 [amend] |
| 07/09/2019 |
10-K
| Annual Report for the period ended April 30, 2019 |
| 08/28/2018 |
10-K/A
| Annual Report for the period ended April 30, 2018 [amend] |
| 07/13/2018 |
10-K
| Annual Report for the period ended April 30, 2018 |
| 08/25/2017 |
10-K/A
| Annual Report for the period ended April 30, 2017 [amend] |
| 07/25/2017 |
10-K
| Annual Report for the period ended April 30, 2017 |
| 08/29/2016 |
10-K/A
| Annual Report for the period ended April 30, 2016 [amend] |
| 07/27/2016 |
10-K
| Annual Report for the period ended April 30, 2016 |
| 08/26/2015 |
10-K/A
| Annual Report for the period ended April 30, 2015 [amend] |
| 07/28/2015 |
10-K
| Annual Report for the period ended April 30, 2015 |
| 07/29/2014 |
10-K
| Annual Report for the period ended April 30, 2014 |
| 07/30/2013 |
10-KT
| Form 10-KT - Transition reports [Rule 13a-10 or 15d-10] |
| 03/18/2013 |
10-K
| Annual Report for the period ended December 31, 2012 |
| 05/24/2012 |
10-K
| Annual Report for the period ended February 29, 2012 |
| 04/12/2011 |
10-K
| Annual Report for the period ended February 28, 2011 |