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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) | 12 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
Accounts Receivable - Allowance for Doubtful Accounts [Member] |  |  |  |  |
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |  |  |
Balance at beginning of period | $ 4,100,000 | $ 4,142,000 |  | $ 4,140,000 |
Charged to cost and expense | 610,000 | 224,000 |  | 21,000 |
Acquisition | 0 | 63,000 | [1] | 0 |
Amounts written off | 458,000 | 329,000 |  | 19,000 |
Balance at end of period | 4,252,000 | 4,100,000 |  | 4,142,000 |
Accounts Receivable - Allowance for Customer-Payment Discrepancies [Member] |  |  |  |  |
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |  |  |
Balance at beginning of period | 854,000 | 1,110,000 |  | 751,000 |
Charged to cost and expense | 1,626,000 | 731,000 |  | 998,000 |
Acquisition | 0 | 0 |  | 0 |
Amounts written off | 1,440,000 | 987,000 |  | 639,000 |
Balance at end of period | 1,040,000 | 854,000 |  | 1,110,000 |
Inventory - Allowance for Excess and Obsolete Inventory [Member] |  |  |  |  |
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |  |  |
Balance at beginning of period | 11,899,000 | 6,682,000 |  | 4,125,000 |
Charged to cost and expense | 13,372,000 | 11,153,000 |  | 8,491,000 |
Acquisition | 0 | 0 |  | 77,000 | [2]
Amounts written off | 12,063,000 | 5,936,000 |  | 6,011,000 |
Balance at end of period | $ 13,208,000 | $ 11,899,000 |  | $ 6,682,000 |
[1] | Allowance for doubtful accounts established in the opening balance sheet in connection with the Company's January 2019 acquisition.
[2] | Allowance for excess and obsolete inventory established in the opening balance sheet in connection with the Company's July 2017 acquisition.

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- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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