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Commitments and Contingent Liabilities | 6 Months Ended
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Sep. 02, 2017
Commitments and Contingencies Disclosure [Abstract] |
Commitments and Contingent Liabilities | Commitments and Contingent Liabilities Operating lease commitments. As of September 2, 2017, 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 2018 |  | Fiscal 2019 |  | Fiscal 2020 |  | Fiscal 2021 |  | Fiscal 2022 |  | Thereafter |  | Total
Total minimum payments | $ | 7,171 |  |  | $ | 13,371 |  |  | $ | 11,324 |  |  | $ | 8,322 |  |  | $ | 7,520 |  |  | $ | 20,820 |  |  | $ | 68,528 |
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 2, 2017, $63.7 million of our backlog was bonded by performance bonds with a face value of $293.6 million. Performance bonds do not have stated expiration dates, as we are released from the bonds upon completion of the contract. We have never been required to make any payments related to these performance bonds with respect to any of our current portfolio of 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 2, 2017 |  | August 27, 2016
Balance at beginning of period | $ | 21,933 |  |  | $ | 16,340 |
Additional accruals | 2,588 |  |  | 2,577 |
Claims paid | (6,800 | ) |  | (3,014 | )
Acquired reserves | 5,571 |  |  | — |
Balance at end of period | $ | 23,292 |  |  | $ | 15,903 |
Letters of credit. At September 2, 2017, we had ongoing letters of credit related to construction contracts and certain industrial revenue bonds. The total value of letters of credit under which we were obligated as of September 2, 2017 was approximately $24.9 million, all of which have been issued under our committed revolving credit facility. Availability under this credit facility is reduced by borrowings under the facility and also by letters of credit issued under the facility. Purchase obligations. Purchase obligations for raw material commitments and capital expenditures totaled $110.0 million as of September 2, 2017. 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.

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