Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Operating activities:
Net income	$ 113,688us-gaap_NetIncomeLoss	$ 7,351us-gaap_NetIncomeLoss	$ 15,014us-gaap_NetIncomeLoss
Adjustments required to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	2,770us-gaap_DepreciationAndAmortization	2,508us-gaap_DepreciationAndAmortization	2,723us-gaap_DepreciationAndAmortization
Bad debt expense	(5)us-gaap_ProvisionForDoubtfulAccounts	47us-gaap_ProvisionForDoubtfulAccounts	33us-gaap_ProvisionForDoubtfulAccounts
Stock-based compensation	16,520us-gaap_ShareBasedCompensation	11,218us-gaap_ShareBasedCompensation	9,501us-gaap_ShareBasedCompensation
Write-down of inventory	2,231us-gaap_InventoryWriteDown	2,012us-gaap_InventoryWriteDown	1,172us-gaap_InventoryWriteDown
Excess tax benefit from stock-based awards	(606)
Loss on disposal of fixed assets			10
Deferred tax (benefit) provision	(87,094)us-gaap_DeferredIncomeTaxExpenseBenefit	860us-gaap_DeferredIncomeTaxExpenseBenefit	755us-gaap_DeferredIncomeTaxExpenseBenefit
Change in fair value of contingent consideration	510
Changes in assets and liabilities:
Accounts receivable	(7,970)	(1,312)	(2,586)
Inventories	(6,967)us-gaap_IncreaseDecreaseInInventories	(622)us-gaap_IncreaseDecreaseInInventories	(5,315)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other assets	(1,479)	(1,039)	(326)
Accounts payable	3,372	(54)	1,183
Accrued expenses and other long-term liabilities	6,011	1,938	3,057
Deferred revenue	2,309	559	1,178
Net cash provided by operating activities	43,290	23,466	26,399
Investing activities:
Purchases of marketable securities	(97,658)	(87,026)	(49,429)
Proceeds from the sale and maturity of marketable securities	71,530	68,265	42,000
Payments for acquisitions, net of cash assumed	(15,697)
Purchase of other investments	(2,850)	(750)
Purchases of property and equipment	(5,188)	(2,761)	(2,836)
Net cash used for investing activities	(49,863)	(22,272)	(10,265)
Financing activities:
Proceeds from the exercise of stock options	10,927	9,360	2,936
Excess tax benefit from stock-based awards	606
Repurchase of common stock			(15,045)
Taxes paid related to net share settlement of vesting of stock awards	(2,805)	(425)	(257)
Proceeds from the issuance of stock under employee stock purchase plan	795	697	555
Net cash provided by (used for) financing activities	9,523	9,632	(11,811)
Effect of exchange rate changes on cash	(1,465)	639	(862)
Net increase in cash and cash equivalents	1,485	11,465	3,461
Cash and cash equivalents at beginning of year	20,916	9,451	5,990
Cash and cash equivalents at end of year	22,401	20,916	9,451
Supplemental disclosure of cash flow information:
Cash paid for income taxes	1,215us-gaap_IncomeTaxesPaid	1,324us-gaap_IncomeTaxesPaid	131us-gaap_IncomeTaxesPaid
Supplemental disclosure of non-cash investing and financing activities:
Contingent consideration related to acquisition of ECP	6,000
Fixed asset expenditures incurred, not yet paid	$ 193	$ 60	$ 250

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+ References

+ Details

Name:	us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
Namespace Prefix:	us-gaap_
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- Definition

Cash outflow for purchase of trading, available-for-sale securities and held-to-maturity securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 13

-Subparagraph (a),(b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585

+ Details

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- Definition

The cash outflow associated with other investments held by the entity for investment purposes not otherwise defined in the taxonomy.

+ References

+ Details

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- Definition

The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

+ References

+ Details

Name:	us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
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- Definition

The cash inflow associated with the amount received from holders to acquire the entity's shares under incentive and share awards other than stock option exercises. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

No definition available.

+ Details

Name:	us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlans
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow associated with the aggregate amount received by the entity through sale or maturity of marketable securities (held-to-maturity or available-for-sale) during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (a),(b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (j)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

+ Details

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Balance Type:	debit
Period Type:	duration

- Definition

Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	duration

- Details

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Balance Type:	na
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