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Segment Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Customer A [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	20.00%	19.00%
Customer B [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	10.00%	13.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer A [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Accounts receivable	$ 2.4	$ 3.0
Concentration risk, percentage	9.00%	15.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer B [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Accounts receivable	$ 3.9	$ 2.5
Concentration risk, percentage	14.00%	13.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer C [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Accounts receivable	$ 4.5	$ 1.5
Concentration risk, percentage	16.00%	8.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer D [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Accounts receivable	$ 4.2	$ 0.7
Concentration risk, percentage	15.00%	3.00%

X

- Definition

For unclassified balance sheet, amounts due from customers or clients for goods or services that have been delivered or sold in the normal course of business.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(5))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(9))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: 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(3))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13531-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 275
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-Name Accounting Standards Codification
-Topic 825
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-Paragraph 21
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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