LONG-TERM DEBT (Details) $ / shares in Units, CAD in Thousands, BRL in Thousands						1 Months Ended					3 Months Ended		9 Months Ended		12 Months Ended
	Jun. 30, 2017 EUR (€)	Jan. 17, 2017 USD ($) shares	Oct. 01, 2016 USD ($)	Jul. 14, 2016 USD ($)	Mar. 22, 2016 USD ($)	Aug. 31, 2016 USD ($)	Jul. 31, 2016 USD ($)	Sep. 30, 2015 EUR (€) installment	Nov. 30, 2012 CAD	Oct. 31, 2006 USD ($)	Jun. 30, 2017 USD ($) $ / shares shares	Mar. 31, 2017 USD ($) shares	Jun. 30, 2017 USD ($) $ / shares shares	Jun. 30, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2017 AUD	Jun. 30, 2017 USD ($)	Jun. 30, 2017 BRL	Mar. 31, 2017 AUD	Mar. 31, 2017 USD ($)	Jul. 31, 2016 AUD loan	May 18, 2016 USD ($)	Mar. 31, 2016 USD ($)	Sep. 30, 2015 USD ($)	Feb. 27, 2014 USD ($)	Feb. 14, 2014 USD ($)	Oct. 21, 2013 property	Dec. 21, 2009 USD ($)
Debt Instrument [Line Items]
Face amount						$ 35,092,000																	$ 8,000,000	$ 32,280,000
Long-term debt outstanding															$ 936,558,000		$ 997,376,000
Underwriting fees and other expense capitalized															10,313,000
Maximum percentage of equity interest of subsidiaries borrowings guaranteed													65.00%
Line of credit facility, amount outstanding																	14,360,000
Issuance of treasury stock in settlement of convertible debt													$ 48,858,000
Number of properties refinanced | property																											4
Debt instrument, description of variable rate basis								The revolving credit facility accrues interest at EURIBOR plus 1.75% per annum (1.75% at June 30, 2017).
Amount of line note available to purchase common stock in open market						$ 10,908,000
Stock issued during period, shares, employee stock ownership plan | shares											72,963,000		621,875
Shares purchased for award value											$ 1,695,000		$ 10,908,000
ESOP, weighted average purchase price of shares purchased (in USD per share) | $ / shares											$ 23.23		$ 17.54
Debt instrument, basis spread on variable rate									1.30%				1.30%
Proceeds from issuance of long-term debt													$ 211,097,000	$ 263,249,000
Capital lease maturity year										2022
Long-term debt, percentage bearing fixed interest, percentage rate										5.00%
Convert. debt due 2017 [Member]
Debt Instrument [Line Items]
Face amount																												$ 100,000,000
Debt instrument, interest rate, stated percentage																												4.00%
Term Loan [Member]
Debt Instrument [Line Items]
Debt instrument, frequency of periodic payment | installment								12
LIBOR Rate [Member]
Debt Instrument [Line Items]
Line of credit facility, interest rate during period					2.25%
Revolving Credit Facility [Member] | Revolving Facility, June 2017 [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity | AUD																AUD 20,000					AUD 10,000,000
Revolver due 2019 [Member]
Debt Instrument [Line Items]
Line of credit facility, amount outstanding																	163,748,000
Line of credit facility, remaining borrowing capacity																	171,892,000
Revolver due 2019 [Member] | Letter Of Credit Subfacility [Member]
Debt Instrument [Line Items]
Line of credit facility, current borrowing capacity					$ 50,000,000
Revolver due 2019 [Member] | Multicurrency Subfacility [Member]
Debt Instrument [Line Items]
Line of credit facility, current borrowing capacity					$ 50,000,000
Revolver due 2019 [Member] | Margin Rate [Member]
Debt Instrument [Line Items]
Line of credit facility, interest rate during period					1.25%
Senior Notes [Member] | Senior Notes 2022 [Member]
Debt Instrument [Line Items]
Long-term debt outstanding																						$ 725,000,000
Senior Notes [Member] | Senior Notes due 2022, May 2016 Add-On Issuance [Member]
Debt Instrument [Line Items]
Face amount																						$ 125,000,000
Issuance price, percentage																						98.76%
Debt issuance cost																	3,016,000
Mortgages [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate											1.50%
Revolver Due 2020 [Member]
Debt Instrument [Line Items]
Line of credit facility, current borrowing capacity					$ 350,000,000
Convertible Notes 2017 [Member]
Debt Instrument [Line Items]
Debt conversion, converted instrument, amount		$ 173,855,000										$ 173,855,000
Debt conversion, converted instrument, cash received		125,000,000										$ 125,000,000
Issuance of treasury stock in settlement of convertible debt		$ 48,858,000
Debt conversion, converted instrument, shares issued | shares		1,954,993										1,954,993
Debt instrument, interest rate, effective percentage		4.00%
Senior notes due 2022 [Member]
Debt Instrument [Line Items]
Face amount																									$ 600,000,000
Debt instrument, interest rate, stated percentage																									5.25%
Long-term debt outstanding															$ 713,754,000		$ 715,170,000
Debt conversion, original debt, amount				$ 125,000,000
Debt instrument, interest rate, effective percentage	5.25%														5.25%	5.25%	5.25%	5.25%
Real estate mortgages [Member]
Debt Instrument [Line Items]
Long-term debt outstanding															$ 37,266,000		$ 35,348,000
Debt instrument, description of variable rate basis													The loans bear interest at a rate of LIBOR plus 1.50%
Debt instrument, basis spread on variable rate													2.25%
ESOP Loans [Member]
Debt Instrument [Line Items]
Long-term debt outstanding															34,150,000		43,014,000
Debt instrument, basis spread on variable rate													2.50%
Debt instrument, periodic payment, principal			$ 569,000										$ 655,000
ESOP Loan July 2014 [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate													2.50%
Term Loan December 2013 and May 2014 [Member] | Northcote Holdings Pty. Ltd [Member]
Debt Instrument [Line Items]
Line of credit facility, amount outstanding																	$ 24,330,000				31,750,000
Debt instrument, basis spread on variable rate							2.00%
Debt instrument, interest rate, effective percentage	3.76%															3.76%	3.76%	3.76%
Term Loan [Member]
Debt Instrument [Line Items]
Long-term debt outstanding	€ 6,250,000																$ 7,131,000
Long-term debt, percentage bearing fixed interest, percentage rate																								2.50%
Proceeds from long-term lines of credit | €								€ 15,000,000
Debt instrument, periodic payment | €								1,250,000
Debt instrument, interest rate, effective percentage	3.85%															3.85%	3.85%	3.85%
Term Loan [Member] | Northcote Holdings Pty. Ltd [Member]
Debt Instrument [Line Items]
Face amount | AUD																					AUD 30,000,000
Number of lines | loan																					2
Term Loan May 2014 [Member] | Northcote Holdings Pty. Ltd [Member]
Debt Instrument [Line Items]
Face amount | AUD																					AUD 10,000,000
Debt instrument, periodic payment, principal							$ 875,000
Line of credit facility, maximum borrowing capacity																			AUD 5,000,000	$ 33,500,000
Medium-term Notes [Member] | Term Loan Due 2019 [Member]
Debt Instrument [Line Items]
Number of loans refinanced with new debt instrument | loan																					2
Debt instrument, periodic payment terms, balloon payment to be paid | AUD																					AUD 24,750,000
Capital lease - real estate [Member]
Debt Instrument [Line Items]
Long-term debt outstanding															$ 6,316,000		$ 5,488,000
Proceeds from issuance of long-term debt										$ 14,290,000
Debt instrument, interest rate, effective percentage	5.00%														5.00%	5.00%	5.00%	5.00%
Revolver Due 2013 [Member]
Debt Instrument [Line Items]
Long-term debt outstanding																	$ 0
Debt instrument, basis spread on variable rate											1.75%		1.75%
Proceeds from long-term lines of credit | €	€ 5,705,000							€ 5,000,000
Non U.S. term loans [Member]
Debt Instrument [Line Items]
Long-term debt outstanding															$ 33,422,000		31,237,000
Line of credit facility, amount outstanding																	1,218,000	BRL 4,029
Maintains maximum amount of line of credit																	$ 2,116,000	BRL 7,000
Non U.S. term loans [Member] | Brazilian CDI [Member]
Debt Instrument [Line Items]
Line of credit facility, interest rate at period end	15.00%															15.00%	15.00%	15.00%
Non U.S. lines of credit [Member]
Debt Instrument [Line Items]
Long-term debt outstanding															11,461,000		$ 1,183,000
Line of credit facility, amount outstanding																	$ 0
Proceeds from long-term lines of credit									CAD 15,000				$ 11,517,000
Non U.S. lines of credit [Member] | Line of Credit One [Member] | Northcote Holdings Pty. Ltd [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate							2.00%
Debt instrument, interest rate, effective percentage	3.67%															3.67%	3.67%	3.67%
Non U.S. lines of credit [Member] | LIBOR Rate [Member]
Debt Instrument [Line Items]
Line of credit facility, interest rate at period end	2.60%															2.60%	2.60%	2.60%
Non U.S. lines of credit [Member] | Bankers Acceptance Rate [Member]
Debt Instrument [Line Items]
Line of credit facility, interest rate at period end	2.31%															2.31%	2.31%	2.31%
Revolver due 2019 [Member]
Debt Instrument [Line Items]
Long-term debt outstanding															$ (2,425,000)		$ 161,708,000
Line of credit facility, current borrowing capacity																										$ 250,000,000
Fair Value, Inputs, Level 1 [Member] | Senior notes due 2022 [Member]
Debt Instrument [Line Items]
Convertible debt, fair value disclosures																	$ 742,255,000