COMMITMENTS AND CONTINGENCIES (NARRATIVE) (DETAILS)	6 Months Ended		9 Months Ended
	Jun. 30, 2012 USD ($)	Jun. 30, 2011 USD ($)	Oct. 01, 2010 USD ($)	Mar. 31, 2012 USD ($)	Mar. 31, 2012 BRL	Mar. 27, 2012 USD ($)	Dec. 31, 2011 USD ($)
COMMITMENTS AND CONTINGENCIES [Abstract]
Initiation date of current line of credit agreement			Oct. 01, 2010
Line of Credit Facility, Rationale for Classification as Long-term Debt			5 Year Term
Initial borrowing capacity			$ 350,000,000
Amended date of current line of credit agreement						Mar. 27, 2012
Increase in borrowing capacity						150,000,000
Maximum borrowing capacity						500,000,000
Borrowings outstanding on credit facility	78,000,000						64,000,000
Average daily utilization under credit facility	137,400,000	83,900,000
Letters of credit issued under credit facility	4,400,000
Remaining borrowing capacity under credit facility	417,600,000
Letters of credit issued outside credit facility	1,100,000
Loss Contingency, Actions Taken by Plaintiff	In 2009, the municipality of Sao Paolo, Brazil assessed the Company’s Brazilian subsidiary a services tax on certain equipment rental income earned in 2004 and 2005.  In March 2011, the Company’s Brazilian subsidiary filed a tax annulment action in the Sao Paolo municipal court to challenge the assessment of services taxes on rental income. Further, in order to halt the possibility of any further interest being charged against the alleged due tax assessments
Loss Contingency, Management's Assessment and Process	Based on an opinion received from legal counsel in Brazil, the Company believes that (i) the ruling issued by the Sao Paolo municipal court was incorrect and in contravention of a Brazil Supreme Court ruling concerning the invalidity of services taxes on rental income, (ii) the Brazilian subsidiary has valid defenses against the assessed services taxes and (iii) that payment of these services taxes is not probable. Accordingly, the Company has not recorded an expense in the three months ended June 30, 2012 for the Sao Paolo services tax assessment.
Loss Contingency, Judicial Deposit Made				$ 4,100,000	6,900,000