Investments (Tables)

9 Months Ended

Mar. 31, 2019

Investments, Debt and Equity Securities [Abstract]

Summary of Short-term Investments by Type

The following tables summarize short-term investments (in thousands):



	March 31, 2019
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Municipal bonds		$96,029		$170		($297	)		$95,902
Corporate bonds	151,244		337		(274		)	151,307
U.S. agency securities	4,689		1		(1		)	4,689
U.S. Treasury securities	28,972		7		(18		)	28,961
Non-U.S. certificates of deposit	50,277		782		—			51,059
U.S. certificates of deposit	—		—		—			—
Commercial paper	1,193		—		—			1,193
Total short-term investments		$332,404		$1,297		($590	)		$333,111

	June 24, 2018
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Municipal bonds		$110,198		$17		($939	)		$109,276
Corporate bonds	77,871		36		(1,150		)	76,757
U.S. agency securities	3,922		—		(38		)	3,884
U.S. Treasury securities	—		—		—			—
Non-U.S. certificates of deposit	77,744		—		—			77,744
U.S. certificates of deposit	500		—		—			500
Commercial paper	—		—		—			—
Total short-term investments		$270,235		$53		($2,127	)		$268,161

Summary of Gross Unrealized Losses and Estimated Fair Value of Short-term Investments, Aggregated by Investment Type and Length of Time

The following tables present the gross unrealized losses and estimated fair value of the Company's short-term investments, aggregated by investment type and the length of time that individual securities have been in a continuous unrealized loss position (in thousands, except numbers of securities):



	March 31, 2019
	Less than 12 Months					Greater than 12 Months					Total
	Fair Value		Unrealized Loss			Fair Value		Unrealized Loss			Fair Value		Unrealized Loss
Municipal bonds		$2,406		$—			$68,677		($297	)		$71,083		($297	)
Corporate bonds	31,144		(17		)	32,930		(257		)	64,074		(274		)
U.S. agency securities	5,788		(1		)	—		—			5,788		(1		)
U.S. Treasury securities	10,110		(2		)	3,907		(16		)	14,017		(18		)
Total		$49,448		($20	)		$105,514		($570	)		$154,962		($590	)
Number of securities with an unrealized loss			54					85					139

	June 24, 2018
	Less than 12 Months					Greater than 12 Months					Total
	Fair Value		Unrealized Loss			Fair Value		Unrealized Loss			Fair Value		Unrealized Loss
Municipal bonds		$97,470		($861	)		$3,642		($78	)		$101,112		($939	)
Corporate bonds	61,453		(1,088		)	1,486		(62		)	62,939		(1,150		)
U.S. agency securities	3,884		(38		)	—		—			3,884		(38		)
U.S. Treasury securities	—		—			—		—			—		—
Total		$162,807		($1,987	)		$5,128		($140	)		$167,935		($2,127	)
Number of securities with an unrealized loss			151					6					157

Contractual Maturities of Short-term Investments by Type

The contractual maturities of short-term investments as of March 31, 2019 were as follows (in thousands):



	Within One Year		After One, Within Five Years		After Five, Within Ten Years		After Ten Years		Total
Municipal bonds		$37,749		$58,153		$—		$—		$95,902
Corporate bonds	61,245		90,062		—		—		151,307
U.S. agency securities	3,988		701		—		—		4,689
U.S. Treasury securities	28,961		—		—		—		28,961
Non-U.S. certificates of deposit	51,059		—		—		—		51,059
Commercial paper	1,193		—		—		—		1,193
Total short-term investments		$184,195		$148,916		$—		$—		$333,111