Securitized Receivables - Summary (Details)	12 Months Ended
	Mar. 31, 2020 USD ($) arrangement	Mar. 31, 2019 USD ($)
Derecognized Assets, Securitized or Asset-backed Financing Arrangement Assets [Line Items]
Number of accounts receivable securitization programs | arrangement	3
Receivables sold, face value discounted (as a percent)	100.00%
Trade and other receivables reduced by net settlement	$ 9,586,000	$ 5,208,000
Receivables outstanding in facility as of March 31:	135,439,000	210,672,000
Beneficial interest	27,021,000	40,332,000
Servicing liability	43,000	90,000
Cash purchase price	523,521,000	672,333,000
Deferred purchase price	240,994,000	242,966,000
Service fees	455,000	576,000
Total	764,970,000	915,875,000
Asset-backed Securities Program Number One
Derecognized Assets, Securitized or Asset-backed Financing Arrangement Assets [Line Items]
Trade receivables sold, maximum amount	125,000,000
Trade receivables sold, limit increasing fees	$ 1,010,000	$ 930,000
Service fee rate (as a percent)	0.50%
Asset Backed Securities Program Number Two
Derecognized Assets, Securitized or Asset-backed Financing Arrangement Assets [Line Items]
Trade receivables sold, maximum amount	$ 125,000,000