Financing Arrangements - Equipment Financing Facilities and Other - Additional Information (Detail) - USD ($)		6 Months Ended		12 Months Ended
		Mar. 31, 2019	Mar. 31, 2018	Sep. 30, 2018
Debt Instrument [Line Items]
Equipment financing facilities, various maturities through September 2021	[1]	$ 9,068,000	$ 13,347,000	$ 11,222,000
Capital lease obligations, various maturities through November 2021	[2]	$ 9,747,000	$ 14,863,000	$ 12,378,000
Capital Lease Obligations [Member]
Debt Instrument [Line Items]
Debt instrument maturity date		Nov. 30, 2021	Nov. 30, 2021	Nov. 30, 2021
Capital lease obligations, various maturities through November 2021		$ 9,700,000
Equipment Financing Facilities and Other [Member]
Debt Instrument [Line Items]
Equipment financing facilities, various maturities through September 2021		$ 9,100,000
Debt instrument maturity date		Sep. 30, 2021
Minimum [Member] | Capital Lease Obligations [Member]
Debt Instrument [Line Items]
Capital Leases of Lessor, Contingent Rentals, Basis Spread on Variable Rate		2.72%
Minimum [Member] | Equipment Financing Facilities and Other [Member]
Debt Instrument [Line Items]
Percentage of Fixed Interest Rate of Equipment Financing Facilities		2.33%
Maximum [Member] | Capital Lease Obligations [Member]
Debt Instrument [Line Items]
Capital Leases of Lessor, Contingent Rentals, Basis Spread on Variable Rate		10.39%
Maximum [Member] | Equipment Financing Facilities and Other [Member]
Debt Instrument [Line Items]
Percentage of Fixed Interest Rate of Equipment Financing Facilities		3.25%

[1] Fixed interest rates ranging from 2.33% to 3.25% for all periods presented.

[2] Fixed interest rates ranging from 2.72% to 10.39% for all periods presented.