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DEBT AND OTHER OBLIGATIONS DEBT AND OTHER OBLIGATIONS (Details) $ in Thousands, $ in Millions |  |  | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 20, 2017 | Dec. 01, 2013 SGD ($) renewal_option | Mar. 31, 2018 USD ($) | Sep. 30, 2017 USD ($) | Mar. 21, 2016 USD ($) | Dec. 01, 2013 USD ($) ft² | Nov. 22, 2013 USD ($)
Capital Leased Assets [Line Items] |  |  |  |  |  |  |
Area of Land | ft² |  |  |  |  |  | 198,000 |
Financing obligation |  |  | $ 16,257 | $ 16,074 |  | $ 20,000 |
K&S Corporate Headquarters [Member] |  |  |  |  |  |  |
Capital Leased Assets [Line Items] |  |  |  |  |  |  |
Lease Agreement Term |  | 10 years | 10 years |  |  |  |
Lessee Leasing Arrangements, Capital Leases, Number of Renewal Options | renewal_option |  | 2 |  |  |  |  |
Lessee Leasing Arrangements, Capital Leases, Renewal Term |  | 10 years |  |  |  |  |
Annual Rent and Service Charge Minimum Range |  | $ 4 |  |  |  |  |
Annual Rent and Service Charge Maximum Range |  | $ 5 |  |  |  |  |
Area of Land | ft² |  |  |  |  |  | 198,000 |
Percentage Of Building Area To Be Leased From Landlord |  |  |  |  |  | 70.00% |
Capital Lease Obligations, Interest Rate, Effective Percentage |  |  |  |  |  | 6.30% |
Citibank [Member] |  |  |  |  |  |  |
Capital Leased Assets [Line Items] |  |  |  |  |  |  |
Capacity under credit facility |  |  |  |  |  |  | $ 5,000
Outstanding amounts under credit facility |  |  | $ 3,500 |  |  |  |
United Overseas Bank Limited [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |
Capital Leased Assets [Line Items] |  |  |  |  |  |  |
Capacity under credit facility |  |  |  |  | $ 25,000 |  |
Credit facility term | 1 year |  |  |  |  |  |
Current and Noncurrent Portion [Member] |  |  |  |  |  |  |
Capital Leased Assets [Line Items] |  |  |  |  |  |  |
Financing obligation |  |  | $ 17,000 |  |  |  |

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