Commitments and Contingent Liabilities

Operating lease commitments

As of September 1, 2018, the Company was obligated under non-cancelable operating leases for buildings and equipment. Certain leases provide for increased rental payments based upon increases in real estate taxes or operating costs. Future minimum rental payments under non-cancelable operating leases are:



In thousands	Remainder of Fiscal 2019		Fiscal 2020		Fiscal 2021		Fiscal 2022		Fiscal 2023		Thereafter		Total
Total minimum payments	$	7,497	$	13,182	$	9,990	$	7,802	$	6,886	$	17,630	$	62,987

Bond commitments

In the ordinary course of business, predominantly in our Architectural Services and Architectural Framing Systems segments, we are required to provide surety or performance bonds that commit payments to our customers for any non-performance. At September 1, 2018, $246.2 million of our backlog was bonded by these types of bonds with a face value of $538.4 million. These bonds do not have stated expiration dates, as we are generally released from the bonds upon completion of the contract. We have not been required to make any payments under these bonds with respect to our existing businesses.

Warranties

We reserve estimated exposures on known claims, as well as on a portion of anticipated claims, for product warranty and rework cost, based on historical product liability claims as a ratio of sales. Claim costs are deducted from the accrual when paid. Factors that could have an impact on the warranty accrual in any given period include the following: changes in manufacturing quality, changes in product mix and any significant changes in sales volume. A warranty rollforward follows:



	Six Months Ended
In thousands	September 1, 2018			September 2, 2017
Balance at beginning of period	$	22,517		$	21,933
Additional accruals	2,087			2,588
Claims paid	(4,580		)	(6,800		)
Acquired reserves	—			5,571
Balance at end of period	$	20,024		$	23,292

Letters of credit

At September 1, 2018, we had $23.5 million of ongoing letters of credit, all of which have been issued under our committed revolving credit facility, as discussed in Note 7.

Purchase obligations

Purchase obligations for raw material commitments and capital expenditures totaled $183.1 million as of September 1, 2018.

New Markets Tax Credit transaction

In August 2018, we entered into a transaction with a subsidiary of Wells Fargo (WF) under a qualified New Markets Tax Credit (NMTC) program related to an investment in plant and equipment within our Architectural Glass segment (the Project). The NMTC transaction is subject to 100 percent tax credit recapture for a period of seven years. Therefore, upon the termination of our arrangement at the end of the seven year period (our fiscal 2026), proceeds received from WF will be recognized in earnings in exchange for the transfer of the tax credits.

WF contributed $6.6 million to the Project, which is included in other non-current liabilities on our consolidated balance sheets. Direct and incremental costs incurred in structuring the arrangement have been deferred and will be recognized in conjunction with the recognition of the related profits. These costs amount to $0.5 million and are included in other non-current assets on our consolidated balance sheets. Variable-interest entities have been created as a result of the transaction structure, which have been included within our consolidated financial statements as WF does not have a material interest in the underlying economics of the Project.

Litigation

We are a party to various legal proceedings incidental to our normal operating activities. In particular, like others in the construction supply and services industry, our businesses are routinely involved in various disputes and claims arising out of construction projects, sometimes involving significant monetary damages or product replacement. We are also subject to litigation arising out of general liability, employment practices, workers' compensation and automobile claims. Although it is very difficult to accurately predict the outcome of such proceedings, facts currently available indicate that no such claims will result in losses that would have a material adverse effect on our results of operations, cash flows or financial condition.