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BALANCE SHEET COMPONENTS (Components of significant balance sheet accounts) (Details) - USD ($)
$ in Thousands
Jul. 01, 2017
Oct. 01, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Short term investments, available-for-sale(1) [1],[2] $ 110,000 $ 124,000
Inventories, net:    
Raw materials and supplies (2) [3] 39,027 26,876
Work in process (2) [3] 48,484 24,333
Finished goods (2) [3] 60,657 57,166
Inventory, gross 148,168 108,375
Inventory reserves (21,786) (21,080)
Inventories, net 126,382 87,295
Property, plant and equipment, net:    
Land 2,182 0
Buildings and building improvements 50,400 34,472
Leasehold improvements 9,790 19,963
Data processing equipment and software (2) [3] 34,376 32,975
Machinery, equipment, furniture and fixtures 64,865 54,730
Property, plant and equipment, gross 161,613 142,140
Accumulated depreciation (2) [3] (95,380) (91,798)
Property, plant and equipment, net 66,233 50,342
Accrued expenses and other current liabilities:    
Wages and benefits 38,596 24,248
Accrued customer obligations (3) [4] 34,607 13,077
Commissions and professional fees 8,150 10,908
Deferred rent 1,938 2,920
Severance (4) [5] 2,944 1,296
Other 15,026 11,505
Accrued expenses and other current liabilities $ 101,261 $ 63,954
[1] All short-term investments were classified as available-for-sale and were measured at fair value based on level one measurement, or quoted market prices, as defined by ASC 820. As of July 1, 2017, fair value approximated the cost basis for short-term investments. The Company did not recognize any realized gains or losses on the sale of investments during the three and nine months ended July 1, 2017 and July 2, 2016.
[2] Fair value approximates cost basis.
[3] Certain balances as at October 1, 2016 relating to Inventories and Property, plant and equipment have been reclassified for comparative purposes. These reclassifications have no impact to the Consolidated Condensed Balance Sheet as at October 1, 2016.
[4] Represents customer advance payments, customer credit program, accrued warranty expense and accrued retrofit obligations.
[5] Includes the restructuring plan discussed in Note 2, severance payable in connection with the October 2015 retirement of the Company's CEO of $0.3 million (as of October 1, 2016: $0.8 million), and other severance payments.