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CASH, CASH EQUIVALENTS, RESTRICTED CASH AND SHORT-TERM INVESTMENTS (Tables)

6 Months Ended

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.