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RESTATEMENT OF CONSOLIDATED FINANCIAL STATEMENTS (Statement of shareholders' equity) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Jul. 01, 2017 | Apr. 01, 2017 | Dec. 31, 2016 | Oct. 01, 2016 | Jul. 02, 2016 | Apr. 02, 2016 | Jan. 02, 2016 | Sep. 30, 2017 | Oct. 01, 2016 | Oct. 03, 2015
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  | $ 799,524 |  |  |  | $ 760,912 | $ 799,524 | $ 760,912 | $ 776,990
Issuance of stock for services rendered |  |  |  |  |  |  |  |  | 750 | 551 | 1,049
Repurchase of common stock |  |  |  |  |  |  |  |  | $ (18,197) | (14,551) | (77,872)
Treasury Stock, Shares, Acquired |  |  |  |  |  |  |  |  | (944,840.00) |  |
Exercise of stock options |  |  |  |  |  |  |  |  | $ 509 | 410 | 694
Issuance of shares for market-based restricted stock and time-based restricted stock |  |  |  |  |  |  |  |  | 0 | 0 | 0
Excess tax benefits from stock based compensation |  |  |  |  |  |  |  |  | (4,392) | 197 | 540
Equity-based compensation expense |  |  |  |  |  |  |  |  | 10,972 | 5,179 | 10,940
Net income | $ 41,225 | $ 34,808 | $ 32,670 | 17,396 | $ 10,761 | $ 32,925 | $ 5,109 | (340) | 126,099 | 48,455 | 51,912
Foreign currency translation adjustment |  |  |  |  |  |  |  |  | 1,960 | 624 | (3,360)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax |  |  |  |  |  |  |  |  | 1,815 | (462) | 0
Unamortized pension costs |  |  |  |  |  |  |  |  | 990 | (1,791) | 19
Comprehensive income |  |  |  |  |  |  |  |  | 130,864 | 46,826 | 48,571
Ending Balance | 920,030 |  |  |  | 799,524 |  |  |  | 920,030 | 799,524 | 760,912
As Previously Reported |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  | 806,518 |  |  |  | 769,249 | 806,518 | 769,249 | 786,600
Issuance of stock for services rendered |  |  |  |  |  |  |  |  | 750 | 551 | 1,049
Repurchase of common stock |  |  |  |  |  |  |  |  | (18,197) | (14,551) | (77,872)
Exercise of stock options |  |  |  |  |  |  |  |  | 509 | 410 | 694
Issuance of shares for market-based restricted stock and time-based restricted stock |  |  |  |  |  |  |  |  | 0 | 0 | 0
Excess tax benefits from stock based compensation |  |  |  |  |  |  |  |  | (4,392) | 197 | 540
Equity-based compensation expense |  |  |  |  |  |  |  |  | 10,972 | 5,179 | 10,940
Net income | 36,576 | 30,811 | 29,041 | 15,583 | 10,329 | 31,785 | 5,089 | (91) | 112,011 | 47,112 | 50,639
Foreign currency translation adjustment |  |  |  |  |  |  |  |  | 1,960 | 624 | (3,360)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax |  |  |  |  |  |  |  |  | 1,815 | (462) |
Unamortized pension costs |  |  |  |  |  |  |  |  | 990 | (1,791) | 19
Comprehensive income |  |  |  |  |  |  |  |  | 116,776 | 45,483 | 47,298
Ending Balance | 912,936 |  |  |  | 806,518 |  |  |  | 912,936 | 806,518 | 769,249
Effect of Restatement |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  | (6,994) |  |  |  | (8,337) | (6,994) | (8,337) | (9,610)
Net income | 4,649 | $ 3,997 | $ 3,629 | 1,813 | 432 | $ 1,140 | $ 20 | (249) | 14,088 | 1,343 | 1,273
Comprehensive income |  |  |  |  |  |  |  |  | 14,088 | 1,343 | 1,273
Ending Balance | 7,094 |  |  |  | (6,994) |  |  |  | 7,094 | (6,994) | (8,337)
Common Stock |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  | $ 498,676 |  |  |  | $ 492,339 | $ 498,676 | $ 492,339 | $ 479,116
Beginning Balance, shares |  |  |  | 70,420,000 |  |  |  | 71,240,000 | 70,420,000 | 71,240,000 | 76,626,000
Issuance of stock for services rendered |  |  |  |  |  |  |  |  | $ 750 | $ 551 | $ 1,049
Issuance of stock for services rendered, shares |  |  |  |  |  |  |  |  | 45,000 | 50,000 | 83,000
Repurchase of common stock |  |  |  |  |  |  |  |  | $ 0 |  | $ 0
Treasury Stock, Shares, Acquired |  |  |  |  |  |  |  |  | (945,000) | (1,408,000) | (6,405,000)
Exercise of stock options |  |  |  |  |  |  |  |  | $ 509 | $ 410 | $ 694
Exercise of stock options, shares |  |  |  |  |  |  |  |  | 61,000 | 53,000 | 75,000
Issuance of shares for market-based restricted stock and time-based restricted stock |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 0
Issuance of shares for market-based restricted stock and time-based restricted stock, shares |  |  |  |  |  |  |  |  | 616,000 | 485,000 | 861,000
Excess tax benefits from stock based compensation |  |  |  |  |  |  |  |  | $ (4,392) | $ 197 | $ 540
Equity-based compensation expense |  |  |  |  |  |  |  |  | 10,972 | 5,179 | 10,940
Ending Balance | $ 506,515 |  |  |  | $ 498,676 |  |  |  | $ 506,515 | $ 498,676 | $ 492,339
Ending Balance, shares | 70,197,000 |  |  |  | 70,420,000 |  |  |  | 70,197,000 | 70,420,000 | 71,240,000
Common Stock | As Previously Reported |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  | $ 498,676 |  |  |  | $ 492,339 | $ 498,676 | $ 492,339 | $ 479,116
Beginning Balance, shares |  |  |  | 70,420,000 |  |  |  | 71,240,000 | 70,420,000 | 71,240,000 | 76,626,000
Issuance of stock for services rendered |  |  |  |  |  |  |  |  | $ 750 | $ 551 | $ 1,049
Issuance of stock for services rendered, shares |  |  |  |  |  |  |  |  | 45,000 | 50,000 | 83,000
Repurchase of common stock |  |  |  |  |  |  |  |  |  |  | $ 0
Treasury Stock, Shares, Acquired |  |  |  |  |  |  |  |  | (945,000) | (1,408,000) | (6,405,000)
Exercise of stock options |  |  |  |  |  |  |  |  | $ 509 | $ 410 | $ 694
Exercise of stock options, shares |  |  |  |  |  |  |  |  | 61,000 | 53,000 | 75,000
Issuance of shares for market-based restricted stock and time-based restricted stock |  |  |  |  |  |  |  |  |  |  | $ 0
Issuance of shares for market-based restricted stock and time-based restricted stock, shares |  |  |  |  |  |  |  |  | 616,000 | 485,000 | 861,000
Excess tax benefits from stock based compensation |  |  |  |  |  |  |  |  | $ (4,392) | $ 197 | $ 540
Equity-based compensation expense |  |  |  |  |  |  |  |  | 10,972 | 5,179 | 10,940
Ending Balance | $ 506,515 |  |  |  | $ 498,676 |  |  |  | $ 506,515 | $ 498,676 | $ 492,339
Ending Balance, shares | 70,197,000 |  |  |  | 70,420,000 |  |  |  | 70,197,000 | 70,420,000 | 71,240,000
Treasury Stock |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  | $ (139,407) |  |  |  | $ (124,856) | $ (139,407) | $ (124,856) | $ (46,984)
Issuance of stock for services rendered |  |  |  |  |  |  |  |  | 0 |  | 0
Repurchase of common stock |  |  |  |  |  |  |  |  | $ (18,197) | $ (14,551) | $ (77,872)
Treasury Stock, Shares, Acquired |  |  |  |  |  |  |  |  | (945,000) | (1,408,000) | (6,405,000)
Ending Balance | $ (157,604) |  |  |  | $ (139,407) |  |  |  | $ (157,604) | $ (139,407) | $ (124,856)
Treasury Stock | As Previously Reported |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  | (139,407) |  |  |  | (124,856) | (139,407) | (124,856) | (46,984)
Issuance of stock for services rendered |  |  |  |  |  |  |  |  |  |  | 0
Repurchase of common stock |  |  |  |  |  |  |  |  | (18,197) | (14,551) | (77,872)
Ending Balance | (157,604) |  |  |  | (139,407) |  |  |  | (157,604) | (139,407) | (124,856)
Retained earnings |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  | 442,981 |  |  |  | 394,526 | 442,981 | 394,526 | 342,614
Net income |  |  |  |  |  |  |  |  | 126,099 | 48,455 | 51,912
Foreign currency translation adjustment |  |  |  |  |  |  |  |  |  |  | 0
Unamortized pension costs |  |  |  |  |  |  |  |  |  |  | 0
Comprehensive income |  |  |  |  |  |  |  |  | 126,099 | 48,455 | 51,912
Ending Balance | 569,080 |  |  |  | 442,981 |  |  |  | 569,080 | 442,981 | 394,526
Retained earnings | As Previously Reported |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  | 449,975 |  |  |  | 402,863 | 449,975 | 402,863 | 352,224
Net income |  |  |  |  |  |  |  |  | 112,011 | 47,112 | 50,639
Foreign currency translation adjustment |  |  |  |  |  |  |  |  | 0 | 0 |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax |  |  |  |  |  |  |  |  | 0 | 0 |
Unamortized pension costs |  |  |  |  |  |  |  |  | 0 | 0 |
Comprehensive income |  |  |  |  |  |  |  |  | 112,011 | 47,112 | 50,639
Ending Balance | 561,986 |  |  |  | 449,975 |  |  |  | 561,986 | 449,975 | 402,863
Retained earnings | Effect of Restatement |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  | (6,994) |  |  |  | (8,337) | (6,994) | (8,337) | (9,610)
Net income |  |  |  |  |  |  |  |  | 14,088 | 1,343 | 1,273
Comprehensive income |  |  |  |  |  |  |  |  | 14,088 | 1,343 | 1,273
Ending Balance | 7,094 |  |  |  | (6,994) |  |  |  | 7,094 | (6,994) | (8,337)
Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  | (2,726) |  |  |  | (1,097) | (2,726) | (1,097) | 2,244
Net income |  |  |  |  |  |  |  |  |  | 0 | 0
Foreign currency translation adjustment |  |  |  |  |  |  |  |  | 1,960 | 624 | (3,360)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax |  |  |  |  |  |  |  |  | 1,815 | (462) |
Unamortized pension costs |  |  |  |  |  |  |  |  | 990 | (1,791) | 19
Comprehensive income |  |  |  |  |  |  |  |  | 4,765 | (1,629) | (3,341)
Ending Balance | 2,039 |  |  |  | (2,726) |  |  |  | 2,039 | (2,726) | (1,097)
Accumulated Other Comprehensive Income | As Previously Reported |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  | $ (2,726) |  |  |  | $ (1,097) | (2,726) | (1,097) | 2,244
Net income |  |  |  |  |  |  |  |  |  |  | 0
Foreign currency translation adjustment |  |  |  |  |  |  |  |  | 1,960 | 624 | (3,360)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax |  |  |  |  |  |  |  |  | 1,815 | (462) |
Unamortized pension costs |  |  |  |  |  |  |  |  | 990 | (1,791) | 19
Comprehensive income |  |  |  |  |  |  |  |  | 4,765 | (1,629) | (3,341)
Ending Balance | $ 2,039 |  |  |  | $ (2,726) |  |  |  | $ 2,039 | $ (2,726) | $ (1,097)

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