SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, AVAILABLE FOR SALE SECURITIES (Details) - USD ($) shares in Thousands, $ in Thousands			12 Months Ended
		Sep. 29, 2015	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities			$ 59,475	$ 10,672
Available-for-sale securities, gross unrealized gain (loss)			7,500	8,100
Total unrealized gains, net of tax			4,400	4,800
Carrying amount of investment			132,002	153,010
Proceeds from sale of available for sale securities			$ 0	$ 0	$ 482
Iroquois [Member]
Schedule of Available-for-sale Securities [Line Items]
Ownership interest, percent			5.53%	5.53%
Carrying amount of investment		$ 21,500	$ 0	$ 24,042
Dominion [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities		$ 46,100	49,400
Ownership interest exchanged (in shares)		1,840
Deferred gain		$ 24,600
Unrealized gain			3,300
Unrealized gain, after tax			1,900
Available-for-sale Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities	[1]		$ 10,100	$ 10,700

[1] Included in other noncurrent assets on the Consolidated Balance Sheets.