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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Mar. 31, 2018
Apr. 01, 2017
Statement of Cash Flows [Abstract]    
Net (loss)/income $ (33,215) $ 50,066
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 9,212 7,775
Equity-based compensation and employee benefits 5,331 6,680
(Excess tax benefits)/Reversal of excess tax benefits from stock-based compensation (50) 742
Adjustment for doubtful accounts 678 (191)
Adjustment for inventory valuation 2,822 3,445
Deferred income taxes 22,823 4,872
Gain on disposal of property, plant and equipment (425) (1,050)
Unrealized foreign currency translation 6,046 (4,789)
Share of results of equity-method investee 23 0
Changes in operating assets and liabilities:    
Accounts and other receivable (26,328) (39,094)
Inventory 157 (17,556)
Prepaid expenses and other current assets 160 (1,141)
Accounts payable, accrued expenses and other current liabilities (9,793) 35,331
Income taxes payable 79,908 (3,821)
Other, net (276) 1,709
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net cash provided by operating activities 57,073 42,978
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of property, plant and equipment (11,700) (17,439)
Purchase of equity investments 0 (1,312)
Proceeds from sales of property, plant and equipment 244 1,352
Purchase of short-term investments (325,000) (139,000)
Maturity of short-term investments 253,000 124,000
Net cash used in investing activities (83,456) (32,399)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Payment on debts (346) (290)
Proceeds from exercise of common stock options 55 389
Repurchase of common stock (23,950) 0
Reversal of excess tax benefits from stock-based compensation 0 (742)
Net cash used in financing activities (24,241) (643)
Effect of exchange rate changes on cash, cash equivalents and restricted cash (1,630) 1,360
Changes in cash, cash equivalents and restricted cash (52,254) 11,296
Cash, cash equivalents and restricted cash at beginning of period 392,940 423,907 [1]
Cash, cash equivalents and restricted cash at end of period 340,686 435,203
CASH PAID FOR:    
Interest 536 523
Income taxes $ 10,728 $ 5,454
[1] * Certain time deposits as at October 1, 2016 have been corrected from cash equivalents to short-term investments for comparative purposes.