Accounts and Taxes Payable and Accrued Liabilities - Accounts Payable and Income Taxes Payable (Detail) - USD ($)	Sep. 30, 2017	Mar. 31, 2017
Payables And Accruals [Abstract]
Accounts payable	$ 13,313,000	$ 13,869,000
Income taxes payable and uncertain tax positions	2,130,000	2,714,000
Total accounts and taxes payable	$ 15,443,000	$ 16,583,000

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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 210.5-02.19(a))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_AccountsPayableCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant