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Segment Information and Sales to Significant Customers - Additional Information (Detail)	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Revenue, Major Customer [Line Items]
Minimum percentage of total revenue accounted for one customer	10.00%	10.00%	10.00%
Revenue [Member] | Customer [Member]
Revenue, Major Customer [Line Items]
Percentage of revenue from significant customer	27.00%	33.00%	33.00%

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- Definition

Minimum percentage of sales to significant customer.

+ References

No definition available.

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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

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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.

+ References

No definition available.

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