We determine whether a contract is, or contains, a lease at inception. ROU assets represent our right to use an underlying asset during the lease term, and lease liabilities represent our obligation to make lease payments arising from the lease. ROU assets and lease liabilities are recognized at lease commencement based upon the estimated present value of unpaid lease payments over the lease term. We use our incremental borrowing rate based on the information available at lease commencement in determining the present value of unpaid lease payments. ROU assets also include any lease payments made at or before lease commencement and any initial direct costs incurred, and exclude any lease incentives received.

We determine the lease term as the noncancellable period of the lease, and may include options to extend or terminate the lease when it is reasonably certain that we will exercise that option. Leases with a term of 12 months or less are not recognized on the balance sheet. Some of our leases include variable lease payments that are based on costs incurred or actual usage, or adjusted periodically based on an index or a rate. Our leases do not contain any residual value guarantees and we do not account for lease and non-lease components as a single lease component. Operating leases are included in operating lease right-of-use assets and operating lease liabilities on our consolidated condensed balance sheets.

We lease certain office space, warehouses and distribution centers, manufacturing facilities, vehicles, and equipment with remaining lease terms ranging from less than 1 year to 14 years, some of which include options to extend or terminate the leases.

Operating lease costs for the three months ended September 30, 2019 were $6.0 million. Short-term and variable lease costs were not material for the three months ended September 30, 2019.

Supplemental balance sheet information related to operating leases was as follows (in thousands, except lease term and discount rate):


	September 30, ‎2019
Operating lease ROU assets	$	81,650

Operating lease liabilities, current portion		19,548
Operating lease liabilities, non-current portion		65,838
Total operating lease liabilities	$	85,386
		-
Future minimum lease payments under noncancelable leases as of September 30, 2019 and for the periods ending June 30:
2020	$	17,502
2021		16,900
2022		12,056
2023		9,629
2024		7,917
2025		5,913
Thereafter		24,988
Total lease payments	$	94,905
Less: imputed interest		(9,519)
Total lease liabilities	$	85,386

Weighted-average remaining lease term (years)		7.37
Weighted-average discount rate		2.9%

As of September 30, 2019, we had additional operating lease commitments of $49.9 million for manufacturing facilities and office space that have not yet commenced. These leases will commence during the year ended June 30, 2020 with lease terms of 5 years to 11 years.

Certain facilities and equipment are leased under operating leases expiring at various dates. Most of the operating leases contain renewal options. Total expense for all operating leases was $23.4 million, $21.1 million, and $20.1 million for the years 2018, 2017, and 2016, respectively.

Future minimum lease payments (including interest) under non-cancelable operating leases at June 30, 2019 were as follows (in thousands):


Fiscal Years	Operating Leases
2020	$	23,500
2021		17,161
2022		12,403
2023		9,478
2024		7,916
Thereafter		27,555
Total minimum lease payments	$	98,013