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Leases | 12 Months Ended
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Apr. 30, 2021
Leases |
Leases | 13. Leases ​ The Company leases certain buildings, land and equipment. At contract inception the Company determines whether the contract is, or contains, a lease and whether the lease should be classified as an operating or a financing lease. Operating leases are recorded in operating lease right-of-use assets, current operating lease liabilities and non-current operating lease liabilities. ​ The Company recognizes operating lease right-of-use assets and operating lease liabilities based on the present value of the future minimum lease payments over the lease term at commencement date. The Company uses its incremental borrowing rate based on the information available at commencement date to determine the present value of future payments and the appropriate lease classification. The Company defines the initial lease term to include renewal options determined to be reasonably certain. The Company’s leases have remaining lease terms of less than one year to nine years, some of which may include options to extend the lease for up to 10 years, and some of which may include options to terminate the lease after two years. If the Company determines it is reasonably certain of exercising an option to extend or terminate, the option is included in the Company’s determination of lease assets and liabilities. For operating leases, the Company recognizes lease expense for these leases on a straight-line basis over the lease term. ​ Many of the Company’s real estate lease agreements contain incentives for tenant improvements, rent holidays, or rent escalation clauses. For tenant improvement incentives, if the incentive is determined to be a leasehold improvement owned by the lessee, the Company generally records incentive as a reduction to fixed lease payments thereby reducing rent expense. For rent holidays and rent escalation clauses during the lease term, the Company records rental expense on a straight-line basis over the term of the lease. For these lease incentives, the Company uses the date of initial possession as the commencement date, which is generally when the Company is given the right of access to the space and begins to make improvements in preparation for intended use. ​ The Company does not have any finance leases. The Company does not have any material restrictions or covenants in its lease agreements, sale-leaseback transactions, land easements or residual value guarantees. ​ In determining the inputs to the incremental borrowing rate calculation, the Company makes judgments about the value of the leased asset, its credit rating and the lease term including the probability of its exercising options to extend or terminate the underlying lease. Additionally, the Company makes judgments around contractual asset substitution rights in determining whether a contract contains a lease. ​ The components of lease costs recorded in cost of sales for product sales and contract services and selling, general and administrative (“SG&A”) expense were as follows (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended | ​ | Year Ended
​ | ​ | April 30, | ​ | April 30,
​ |  | 2021 | ​ | 2020
Operating lease cost | ​ | $ | 5,150 | ​ | $ | 4,574
Short term lease cost | ​ | ​ | 602 | ​ | ​ | 500
Variable lease cost | ​ | ​ | 23 | ​ | ​ | 987
Sublease income | ​ | ​ | (91) | ​ | ​ | (287)
Total lease costs, net | ​ | $ | 5,684 | ​ | $ | 5,774
​ Supplemental lease information was as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended | ​ | Year Ended
​ | ​ | April 30, | ​ | April 30,
​ |  | 2021 | ​ | 2020
​ | ​ | (In thousands) | ​ | (In thousands)
Cash paid for amounts included in the measurement of operating lease liabilities | ​ | $ | 5,070 | ​ | $ | 3,897
Right-of-use assets obtained in exchange for new lease liabilities | ​ | $ | 18,729 | ​ | $ | 13,022
​ | ​ | ​ | ​ | ​ | ​ | ​
Weighted average remaining lease term | ​ | ​ | 71 months | ​ | ​ | 34 months
Weighted average discount rate | ​ | ​ | 3.6% | ​ | ​ | 3.7%
​ Maturities of operating lease liabilities as of April 30, 2021 were as follows (in thousands): ​
​ | ​ | ​ | ​
2022 | ​ | $ | 6,711
2023 | ​ |  | 5,185
2024 | ​ |  | 4,496
2025 | ​ |  | 3,530
2026 | ​ |  | 2,329
Thereafter | ​ | ​ | 6,572
Total lease payments | ​ | ​ | 28,823
Less: imputed interest | ​ | ​ | (3,566)
Total present value of operating lease liabilities | ​ | $ | 25,257
​ Rental expense under operating leases was approximately $4,609,000 for the year ended April 30, 2019.

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