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BALANCE SHEET COMPONENTS (Components of significant balance sheet accounts) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Oct. 01, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Short-term Investments [1] $ 216,000 $ 124,000 [2]
Inventories, net:    
Raw materials and supplies (2) [3] 44,239 26,876
Work in process (2) [3] 40,827 24,333
Finished goods (2) [3] 61,596 57,166
Inventory, gross 146,662 108,375
Inventory reserves (24,639) (21,080)
Inventories, net 122,023 87,295
Property, plant and equipment, net:    
Land 2,182 0
Buildings and building improvements 50,910 34,472
Leasehold improvements 9,882 19,963
Data processing equipment and software (2) [3] 34,700 32,975
Machinery, equipment, furniture and fixtures 68,143 54,730
Property, plant and equipment, gross 165,817 142,140
Accumulated depreciation(2) [3] (98,055) (91,798)
Property, plant and equipment, net 67,762 50,342
Accrued expenses and other current liabilities:    
Wages and benefits 47,411 24,248
Accrued customer obligations (3) (As Restated) [2] 52,460 21,483
Commissions and professional fees (As Restated) 8,555 10,908
Deferred rent 1,930 2,920
Severance (4) [4] 3,828 1,296
Other (As Restated) 10,663 10,461
Accrued expenses and other current liabilities $ 124,847 $ 71,316
[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 September 30, 2017 and October 1, 2016, 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 years ended 2017 and 2016.
[2] Represents customer advance payments, customer credit program, accrued warranty expense and accrued retrofit obligations.
[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 Balance Sheets as at October 1, 2016.
[4] Includes the restructuring plan discussed in Note 3, severance payable in connection with the October 2015 retirement of the Company's CEO of $0.2 million (as of October 1, 2016: $0.8 million), and other severance payments which are not part of the Company's plan to streamline its global operations and functions.