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Cash, Cash Equivalents and Investments with Hierarchy (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Sep. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Mar. 31, 2014
Amortized Costs	$ 155,009		$ 177,198
Gross Unrealized Gains	17		71
Gross Unrealized Loss	(441)		(175)
Estimated Fair Value	154,585		177,094
Cash and cash equivalents	23,866		53,110	$ 52,598		$ 59,159
Short-term marketable investments	130,719		123,984
Liabilities, Fair Value Disclosure	341	$ 391	0	$ 0	$ 0	$ 0
Aavailable-for-sale investments due within one year	65,670
Aavailable-for-sale investments due after one year	65,049
Level 1
Amortized Costs	25,866		55,110
Gross Unrealized Gains	0		0
Gross Unrealized Loss	(198)		(107)
Estimated Fair Value	25,668		55,003
Cash and cash equivalents	23,866		53,110
Short-term marketable investments	1,802		1,893
Level 2
Amortized Costs	129,143		122,088
Gross Unrealized Gains	17		71
Gross Unrealized Loss	(243)		(68)
Estimated Fair Value	128,917		122,091
Cash and cash equivalents	0		0
Short-term marketable investments	128,917		122,091
Level 3
Amortized Costs	0
Gross Unrealized Gains	0
Gross Unrealized Loss	0
Estimated Fair Value	341
Cash and cash equivalents	0
Short-term marketable investments	0
Liabilities, Fair Value Disclosure	341
Cash
Amortized Costs	10,996		24,734
Gross Unrealized Gains	0		0
Gross Unrealized Loss	0		0
Estimated Fair Value	10,996		24,734
Cash and cash equivalents	10,996		24,734
Short-term marketable investments	0		0
Money Market Funds | Level 1
Amortized Costs	12,870		28,376
Gross Unrealized Gains	0		0
Gross Unrealized Loss	0		0
Estimated Fair Value	12,870		28,376
Cash and cash equivalents	12,870		28,376
Short-term marketable investments	0		0
Mutual Funds | Level 1
Amortized Costs	2,000		2,000
Gross Unrealized Gains	0		0
Gross Unrealized Loss	(198)		(107)
Estimated Fair Value	1,802		1,893
Cash and cash equivalents	0		0
Short-term marketable investments	1,802		1,893
Commercial Paper | Level 2
Amortized Costs	13,483		9,043
Gross Unrealized Gains	1		1
Gross Unrealized Loss	(3)		0
Estimated Fair Value	13,481		9,044
Cash and cash equivalents	0		0
Short-term marketable investments	13,481		9,044
Corporate Debt | Level 2
Amortized Costs	77,999		75,284
Gross Unrealized Gains	14		57
Gross Unrealized Loss	(138)		(10)
Estimated Fair Value	77,875		75,331
Cash and cash equivalents	0		0
Short-term marketable investments	77,875		75,331
Municipal Securities | Level 2
Amortized Costs	5,745		5,435
Gross Unrealized Gains	1		2
Gross Unrealized Loss	(1)		(1)
Estimated Fair Value	5,745		5,436
Cash and cash equivalents	0		0
Short-term marketable investments	5,745		5,436
Asset-backed Securities | Level 2
Amortized Costs	21,782		21,503
Gross Unrealized Gains	0		4
Gross Unrealized Loss	(46)		(5)
Estimated Fair Value	21,736		21,502
Cash and cash equivalents	0		0
Short-term marketable investments	21,736		21,502
Mortgage backed Securities | Level 2
Amortized Costs	2,328		5,822
Gross Unrealized Gains	0		0
Gross Unrealized Loss	(33)		(52)
Estimated Fair Value	2,295		5,770
Cash and cash equivalents	0		0
Short-term marketable investments	2,295		5,770
Agency Bond | Level 2
Amortized Costs	6,806		4,201
Gross Unrealized Gains	0		3
Gross Unrealized Loss	(22)		0
Estimated Fair Value	6,784		4,204
Cash and cash equivalents	0		0
Short-term marketable investments	6,784		4,204
International Government Securities | Level 2
Amortized Costs	1,000		800
Gross Unrealized Gains	1		4
Gross Unrealized Loss	0		0
Estimated Fair Value	1,001		804
Cash and cash equivalents	0		0
Short-term marketable investments	1,001		$ 804
Contingent Consideration | Level 3
Amortized Costs	0
Gross Unrealized Gains	0
Gross Unrealized Loss	0
Estimated Fair Value	341
Cash and cash equivalents	0
Short-term marketable investments	0
Liabilities, Fair Value Disclosure	$ 341

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