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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Balance at beginning of period |  |  | $ 248,681,000 |
Other comprehensive income (loss), net of tax | $ 668,000 | $ (741,000) | 953,000 | $ (1,254,000)
Amounts reclassified from accumulated other comprehensive loss, net of tax | 0 | 0 | 0 | 0
Balance at end of period | 274,096,000 |  | 274,096,000 |
AOCI Attributable to Parent [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Balance at beginning of period | (7,156,000) | (5,365,000) | (7,441,000) | (4,852,000)
Balance at end of period | (6,488,000) | (6,106,000) | (6,488,000) | (6,106,000)
Unrealized Gain (Loss) on Short-Term Investments [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Balance at beginning of period | 584,000 | 354,000 | 528,000 | 332,000
Other comprehensive income (loss), net of tax | 60,000 | 66,000 | 116,000 | 88,000
Amounts reclassified from accumulated other comprehensive loss, net of tax | 0 | 0 | 0 | 0
Balance at end of period | 644,000 | 420,000 | 644,000 | 420,000
Foreign Currency Translation [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Balance at beginning of period | (7,740,000) | (5,719,000) | (7,969,000) | (5,184,000)
Other comprehensive income (loss), net of tax | 608,000 | (807,000) | 837,000 | (1,342,000)
Amounts reclassified from accumulated other comprehensive loss, net of tax | 0 | 0 | 0 | 0
Balance at end of period | $ (7,132,000) | $ (6,526,000) | $ (7,132,000) | $ (6,526,000)

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- Definition Amount after tax, before reclassification adjustments, of other comprehensive income (loss), attributable to parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84158357&loc=d3e1436-108581 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(31)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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