Derivative Instruments - Additional Information (Detail) (Foreign Exchange Forward) In Millions, unless otherwise specified	Sep. 30, 2014 USD ($)	Jun. 30, 2014 USD ($)	Sep. 30, 2014 Minimum JPY (¥)	Sep. 30, 2014 Maximum JPY (¥)
Derivative [Line Items]
Foreign currency forward exchange contracts, notional amount	$ 10.9	$ 7.4	¥ 250.0	¥ 400.0

Nominal or face amount used to calculate payments on the derivative liability.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1B

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1A

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5579245-113959

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Notional Amount

-URI http://asc.fasb.org/extlink&oid=6519104

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant