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CASH, CASH EQUIVALENTS, RESTRICTED CASH AND SHORT-TERM INVESTMENTS (Tables) | 6 Months Ended
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Mar. 31, 2018
Cash and Cash Equivalents [Abstract] |
Cash, cash equivalents, restricted cash and short-term investments | Cash, cash equivalents, restricted cash and short-term investments consisted of the following as of March 31, 2018:
(in thousands) | Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Estimated Fair Value
Current assets: |  |  |  |  |  |  |
Cash | $ | 54,378 |  |  | $ | — |  |  | $ | — |  |  | $ | 54,378 |
Cash equivalents: |  |  |  |  |  |  |
Money market funds (1) | 210,809 |  |  | — |  |  | (16 | ) |  | 210,793 |
Time deposits (2) | 55,009 |  |  | — |  |  | — |  |  | 55,009 |
Commercial paper (2) | 19,971 |  |  | — |  |  | — |  |  | 19,971 |
Total cash and cash equivalents | $ | 340,167 |  |  | $ | — |  |  | $ | (16 | ) |  | $ | 340,151 |
Restricted Cash (2) | 535 |  |  | — |  |  | — |  |  | 535 |
Total cash, cash equivalents, and restricted cash | $ | 340,702 |  |  | $ | — |  |  | $ | (16 | ) |  | $ | 340,686 |
Short-term investments (2): |  |  |  |  |  |  |
Time deposits | 192,000 |  |  | — |  |  | — |  |  | 192,000 |
Deposits (3) | 96,000 |  |  | — |  |  | — |  |  | 96,000 |
Total short-term investments | $ | 288,000 |  |  | $ | — |  |  | $ | — |  |  | $ | 288,000 |
Total cash, cash equivalents, restricted cash and short-term investments | $ | 628,702 |  |  | $ | — |  |  | $ | (16 | ) |  | $ | 628,686 |
(1) | The fair value was determined using unadjusted prices in active, accessible markets for identical assets, and as such they were classified as Level 1 assets in the fair value hierarchy.
(2) | Fair value approximates cost basis.
(3) | Represents deposits that require a notice period of three months for withdrawal.
Cash, cash equivalents, restricted cash and short-term investments consisted of the following as of September 30, 2017:
(in thousands) | Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Estimated Fair Value
Current assets: |  |  |  |  |  |  |
Cash | $ | 65,759 |  |  | $ | — |  |  | $ | — |  |  | $ | 65,759 |
Cash equivalents (1): |  |  |  |  |  |  |
Money market funds | 232,069 |  |  | — |  |  | — |  |  | 232,069 |
Time deposits | 89,087 |  |  | — |  |  | — |  |  | 89,087 |
Commercial paper | 5,495 |  |  | — |  |  | — |  |  | 5,495 |
Total cash and cash equivalents | $ | 392,410 |  |  | $ | — |  |  | $ | — |  |  | $ | 392,410 |
Restricted Cash (1) | 530 |  |  |  |  |  |  | 530 |
Total cash, cash equivalents, and restricted cash | $ | 392,940 |  |  | $ | — |  |  | $ | — |  |  | $ | 392,940 |
Short-term investments (1): |  |  |  |  |  |  |
Time deposits | 120,000 |  |  | — |  |  | — |  |  | 120,000 |
Deposits (2) | 96,000 |  |  | — |  |  | — |  |  | 96,000 |
Total short-term investments | $ | 216,000 |  |  | $ | — |  |  | $ | — |  |  | $ | 216,000 |
Total cash, cash equivalents, restricted cash and short-term investments | $ | 608,940 |  |  | $ | — |  |  | $ | — |  |  | $ | 608,940 |
(1) | Fair value approximates cost basis.
(2) | Represents deposits that require a notice period of three months for withdrawal.

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- Definition Tabular disclosure of the components of cash, cash equivalents, and investments. + References No definition available. + Details
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