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Accounts Payable and Accrued Liabilities
 3 Months Ended
Sep. 30, 2018
Accounts Payable and Accrued Liabilities [Abstract]  
ACCOUNTS PAYABLE AND ACCRUED LIABILITIES ACCOUNTS PAYABLE AND ACCRUED LIABILITIES
Current liabilities
Accounts payable and accrued liabilities are comprised of the following:
 
 
As of September 30, 2018
 
As of June 30, 2018
Accounts payable—trade
$
21,176

 
$
41,722

Accrued salaries and commissions
84,918

 
118,024

Accrued liabilities
100,457

 
108,903

Accrued interest on Senior Notes
26,021

 
24,786

Amounts payable in respect of restructuring and other Special charges
17,712

 
5,622

Asset retirement obligations
1,795

 
3,097

Total
$
252,079

 
$
302,154


Long-term accrued liabilities 
 
As of September 30, 2018
 
As of June 30, 2018
Amounts payable in respect of restructuring and other Special charges
$
5,740

 
$
4,362

Other accrued liabilities*
31,965

 
35,874

Asset retirement obligations
13,463

 
12,591

Total
$
51,168

 
$
52,827


* Other accrued liabilities consist primarily of tenant allowances, deferred rent and lease fair value adjustments relating to certain facilities acquired through business acquisitions.
Asset retirement obligations
We are required to return certain of our leased facilities to their original state at the conclusion of our lease. As of September 30, 2018, the present value of this obligation was $15.3 million (June 30, 2018—$15.7 million), with an undiscounted value of $17.1 million (June 30, 2018—$17.7 million).