BUSINESS SEGMENT INFORMATION (Details 2) (USD $)	3 Months Ended								12 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Business segment financial data
Sales	$ 340,776,000	$ 337,226,000	$ 368,609,000	$ 314,796,000	$ 369,255,000	$ 371,142,000	$ 343,830,000	$ 319,857,000	$ 1,361,407,000	$ 1,404,084,000	$ 1,301,584,000
Long-lived assets, net	59,700,000				58,000,000				59,700,000	58,000,000	52,500,000
United States
Business segment financial data
Sales									741,700,000	742,200,000	753,900,000
Long-lived assets, net	43,900,000				42,400,000				43,900,000	42,400,000	40,500,000
United Kingdom
Business segment financial data
Sales									267,400,000	283,200,000	250,900,000
Long-lived assets, net	9,200,000				9,500,000				9,200,000	9,500,000	9,100,000
Canada
Business segment financial data
Sales									30,400,000	54,800,000	27,500,000
Australia
Business segment financial data
Sales									148,500,000	181,900,000	100,300,000
Middle East
Business segment financial data
Sales									35,400,000	38,000,000	38,700,000
Far East
Business segment financial data
Sales									78,200,000	56,900,000	82,700,000
Other foreign countries
Business segment financial data
Sales									59,800,000	47,100,000	47,600,000
Long-lived assets, net	$ 6,600,000				$ 6,100,000				$ 6,600,000	$ 6,100,000	$ 2,900,000