CREDIT AGREEMENT AND RELATED INSTRUMENTS (Details) (USD $)	3 Months Ended		9 Months Ended					9 Months Ended													3 Months Ended				3 Months Ended
	Jun. 30, 2013	Mar. 31, 2013	Jun. 30, 2013	Jul. 01, 2012	Jun. 30, 2013 Interest Rate Swap derivative_agreements	Jul. 01, 2012 Interest Rate Swap	Sep. 30, 2012 Interest Rate Swap	Jun. 30, 2013 Interest Rate Swap Group 1	Jun. 30, 2013 Interest Rate Swap Group 2	Jun. 30, 2013 Minimum	Jun. 30, 2013 Maximum	Jun. 30, 2013 Revolving and swingline loans	Jun. 30, 2013 Revolving and swingline loans Base Rate Amended and Restated Credit Agreement	Jun. 30, 2013 Revolving and swingline loans Eurodollar Amended and Restated Credit Agreement	Jun. 30, 2013 Term loans	Jun. 30, 2013 Term loans Base Rate Amended and Restated Credit Agreement	Jun. 30, 2013 Term loans Eurodollar Amended and Restated Credit Agreement	Jun. 30, 2013 Term loans Minimum Eurodollar	Jun. 30, 2013 Letter of Credit	Jun. 30, 2013 Revolving and swingline loans	Mar. 31, 2013 Revolving and swingline loans Eurodollar Amended and Restated Credit Agreement	Mar. 31, 2013 Revolving and swingline loans Minimum Prime Rate Amended and Restated Credit Agreement	Mar. 31, 2013 Revolving and swingline loans Minimum Federal Funds Effective Rate Amended and Restated Credit Agreement	Jun. 30, 2013 Revolving and swingline loans Minimum Federal Funds Effective Rate Amended and Restated Credit Agreement	Mar. 31, 2013 Revolving and swingline loans Minimum Eurodollar, One Month Amended and Restated Credit Agreement	Jun. 30, 2013 Revolving and swingline loans Minimum Eurodollar, One Month Amended and Restated Credit Agreement
Line of Credit Facility [Line Items]
Face amount																				$ 50,000,000
Borrowed under term loan facility												0			699,000,000
Maximum amount allowed to be requested for a loan or revolving credit facility	200,000,000		200,000,000
Payments of debt extinguishment costs			277,539,000	470,296,000
Debt extinguishment expense	3,000,000
Description of variable rate basis																					eurodollar	prime rate	federal funds effective rate		one-month Eurodollar rate
Amount rounded up to nearest percentage of rate determined by agent		0.01%
Term loan borrowings effective rate under Eurodollar rate	3.75%		3.75%
Debt instrument, interest rate margin													3.50%	4.50%		1.75%	2.75%							0.50%		1.00%
Debt, stated rate																2.00%		1.00%
Fair value outstanding term loan															699,900,000
Maturity date			Feb. 19, 2020
Debt instrument, annual principal payment	7,300,000		7,300,000
Optional principal prepayment	23,000,000		77,000,000
Excess Cash Flow (ECF) percentage										0.00%	50.00%
Undrawn commitment fee percentage			0.375%
Fronting fee on letters of credit																			0.0025
Number of derivative agreements					2
Notional amount								121,000,000	24,000,000
Fixed rate								1.83%	2.21%
Derivative maturity period								Jan. 06, 2014	Jan. 05, 2015
Current liability related to interest rate swap agreements					500,000
Long-term liability related to interest rate swap agreements					400,000		1,900,000
Gain on interest rate swaps					1,000,000
Loss on interest rate swaps						$ 500,000