FAIR VALUE OF FINANCIAL ASSETS AND LIABILITIES (Details) (Fair Value, Measurements, Recurring, USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Sep. 30, 2012
Total
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	$ 220,945	$ 204,335
Pension plan assets	5,604	5,382
Interest rate swap liabilities	961	1,950
Level 1 Inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	220,945	204,335
Pension plan assets	0	0
Interest rate swap liabilities	0	0
Level 2 Inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	0	0
Pension plan assets	0	0
Interest rate swap liabilities	961	1,950
Level 3 Inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	0	0
Pension plan assets	5,604	5,382
Interest rate swap liabilities	$ 0	$ 0