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Inventory - Schedule of Inventory (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Mar. 31, 2017
Inventory Disclosure [Abstract]
Raw materials	$ 5,544	$ 4,263
Work-in-process	1,626	426
Finished goods	7,931	8,016
Deferred program costs	2,028	4,757
Net inventory	$ 17,129	$ 17,462

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Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

+ 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 210.5-02.6(a)(1))
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Amount before valuation and LIFO reserves, and progress payments, of inventory associated with long-term contracts, expected to be sold, or consumed within one year or operating cycle, if longer.

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-Publisher FASB
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-Topic 210
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-Section S99
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-Subparagraph (SX 210.5-02.6(a),(d))
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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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-Subparagraph (SX 210.5-02.6(a))
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-Section 35
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-URI http://asc.fasb.org/extlink&oid=68049868&loc=d3e3927-108312

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Amount before valuation and LIFO reserves of raw materials expected to be sold, or consumed within one year or operating cycle, if longer.

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Amount before valuation and LIFO reserves of merchandise or goods in the production process expected to be completed within one year or operating cycle, if longer.

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