Financial Instruments and Fair Value Measurement (Tables)

9 Months Ended

Jun. 30, 2016

Financial Instruments and Fair Value Measurement

Summary of available-for-sale securities


			Gross		Gross		Estimated
			Unrealized		Unrealized		Fair
	Cost		Gains		Losses		Value
	(in thousands)

Equity securities June 30, 2016	$	64,462	$	33,257	$	10,669	$	87,050
Equity securities September 30, 2015	$	64,462	$	28,530	$	1,509	$	91,483

Summary of assets measured at fair value


	Total		Level 1		Level 2		Level 3
	(in thousands)
Recurring fair value measurements:
Short-term investments:
Certificate of deposit	$	2,000	$	—	$	2,000	$	—
Corporate debt securities	20,608		—		20,608		—
U.S. government and federal agency securities	26,957		17,751		9,206		—

Total short-term investments	49,565		17,751		31,814		—
Cash and cash equivalents	907,032		907,032		—
Investments	87,050		87,050		—		—
Other current assets	26,813		26,563		250		—
Other assets	2,000		2,000		—		—

Total assets measured at fair value	$	1,072,460	$	1,040,396	$	32,064	$	—

Nonrecurring fair value measurements:
Assets:
Assets held for sale (1)	$	3,840	$	—	$	—	$	3,840

(1)

Represents the book value as of June 30, 2016 of decommissioned rigs and rig related equipment written down to their estimated recoverable amounts at June 30, 2016. These assets are included in assets held for sale in our Consolidated Condensed Balance Sheets.

Summary of supplemental fair value information about long-term fixed-rate debt


	June 30,		September 30,
	2016		2015
	(in millions)

Carrying value of long-term fixed-rate debt	$	532.4	$	531.5
Fair value of long-term fixed-rate debt	$	569.4	$	553.5